Everything good about this pudding is decided in about ninety seconds, in a dry pan, watching sugar change colour. Get the caramel right and the rest is assembly. Get it wrong and you’ve either got a jar of sweet beige syrup or something with a burnt edge that no amount of cream will rescue.
So this is mostly about the caramel. The custard and the layering come after, and they’re the easy part.
Caramel 10 minutes · Custard 10 minutes · Assembly 25 minutes · Chill 4 hours minimum · Serves 8
Dry Caramel or Wet Caramel
Two methods. Dry means sugar alone in the pan. Wet means sugar plus enough water to look like wet sand, usually a quarter of the sugar’s volume.
Dry is faster — about 6 minutes for a cup of sugar in a heavy pan over medium heat, versus 10 or 11 for wet, because the water has to boil off first. Dry also colours unevenly. The sugar touching the metal melts while the pile on top is still crystals, so you get amber pools next to white grit and you’re constantly nudging it together with a spatula.
Wet is slower and far more forgiving. The sugar dissolves fully before it starts to colour, so it browns as one even sheet and you can see what shade you’re at. The trade is that dissolved syrup can re-crystallise into a gritty mass if a stray crystal falls in off the pan wall.
I use wet, and I brush the sides down with a wet pastry brush twice while it heats. That handles the crystallising entirely. If you’ve never made caramel, start wet — the extra four minutes buys a lot of visibility.
The Temperature Window That Decides Colour and Bitterness
Sugar doesn’t caramelise at one temperature, it caramelises across a range, and the range is narrow enough that thirty seconds changes the result.
- 320–335°F (160–168°C) — pale straw. Sweet, almost no caramel flavour yet. Pull here and the finished pudding tastes like sugar syrup.
- 340–350°F (171–177°C) — light amber, the colour of clear honey. Fine, but still on the sweet side of where you want to be.
- 355–365°F (180–185°C) — deep amber, close to an old copper coin. This is the target. Enough bitterness to stand up against banana and whipped cream.
- Past 375°F (190°C) — smoke, and a genuinely acrid taste that reads as burnt rather than dark.
The gap between target and ruined is roughly 20°F, which a hot pan crosses in under a minute. Colour is the more practical guide than a thermometer, since you’re watching the pan anyway. Pull it off the heat one shade before what you want; carry-over in a heavy pan takes it another 10 to 15°F on its own.
Judge that colour against something white. Caramel in a dark pan looks two shades lighter than it is, which is how I burnt my first three batches. A stainless pan, or a white saucer to dribble a drop onto, solves it.
Why Cold Cream Seizes a Caramel
You’ve got molten sugar at around 360°F. You pour in cream straight from the fridge at 40°F. Two things happen at once.
The water in the cream flashes to steam, which is the violent bubbling that climbs the pan and the reason you want a pan three times deeper than the caramel in it. And the sugar touching that cold liquid drops below its melting point in a fraction of a second and sets solid — hard lumps of amber sitting in a thin sauce.
Warm cream fixes it. I heat mine to just steaming, about 150°F, in the microwave while the sugar colours, then add it in three goes, whisking between. Lumps still form. They’re small, and a minute of gentle heat dissolves them back in.
Butter goes in first, off the heat, cubed. It cools the caramel slightly and starts the emulsion, so the cream has a smaller gap to bridge when it arrives.
Salt Goes In at the End, and Not the Fine Stuff
Salt added to the sugar at the start doesn’t hurt anything, it just disappears. You can’t taste 360°F caramel to check, so you’re seasoning blind, and by the time it’s cool enough to taste, it’s too thick to whisk more in easily.
So: caramel finished, off the heat, cooled for five minutes, then salt to taste. Start with 1/2 teaspoon of fine salt in a cup of caramel and go up. Salted caramel that tastes distinctly salty when eaten off a spoon will taste correctly balanced once it’s buried under custard and cream — the dairy mutes it considerably.
The flaky salt on top is a separate job. That one is texture, not seasoning, and it needs to go on within a few minutes of serving or it dissolves into the whipped cream and you’ve wasted it. I’ve made that mistake at a dinner and watched the crystals vanish while people were still finishing their mains.
Ingredients
- 3 cups whole milk
- 2/3 cup granulated sugar, for the custard
- 1/4 cup cornstarch
- 1/4 teaspoon fine salt
- 4 large egg yolks
- 2 tablespoons unsalted butter, for the custard
- 2 teaspoons pure vanilla extract
- 1 cup heavy cream, cold, for whipping
- 2 tablespoons powdered sugar
- 4 to 5 ripe but firm bananas
- 1 box (11 oz) vanilla wafer cookies
- 3/4 cup salted caramel sauce — store-bought, or made from: 1 cup granulated sugar, 1/4 cup water, 6 tablespoons unsalted butter cubed, 1/2 cup heavy cream warmed, 1/2 to 1 teaspoon fine salt
- Flaky sea salt, to finish
Instructions
- If making the caramel, combine the 1 cup sugar and 1/4 cup water in a heavy saucepan over medium heat. Don’t stir once it’s dissolved; swirl the pan instead and brush the sides down with a wet brush. Cook 9 to 11 minutes to deep amber, then pull it off the heat.
- Whisk in the cubed butter, then the warmed cream in three additions, standing back from the steam. Return to low heat for 1 minute if any lumps remain. Cool 5 minutes, then salt to taste. You’ll have about 1 cup; it thickens as it cools.
- For the custard, whisk the 2/3 cup sugar, cornstarch and fine salt together in a cold saucepan. Whisk in the milk slowly until smooth, then the egg yolks.
- Set over medium heat and whisk constantly, getting into the corners of the pan. At 6 to 8 minutes it thickens abruptly. Let it bubble gently for a full minute after that to cook out the raw starch taste.
- Off the heat, whisk in the butter and vanilla. Pour through a sieve into a bowl, press cling film onto the surface, and chill at least 1 hour.
- Whip the cold cream with the powdered sugar to soft peaks. Fold half into the cooled custard; reserve the rest.
- Slice the bananas about 1/4 inch thick. Layer into a trifle dish: wafers, bananas, a drizzle of caramel, then custard. Repeat two or three times.
- Top with the reserved whipped cream and a swirl of caramel, then cover and refrigerate 4 hours or overnight.
- Add crushed wafers and the flaky salt in the last five minutes before it goes to the table.
The Minute After the Custard Thickens
Cornstarch custard catches people out because it thickens all at once. Five minutes of nothing, then over about twenty seconds the whisk starts leaving tracks. The instinct is to pull it off immediately. Don’t.
Cornstarch has to reach a gentle boil to set fully and lose its chalky taste, and an enzyme in raw yolk will thin the custard back out overnight if it isn’t cooked through. One minute at a lazy bubble handles both. It looks alarmingly thick in the pan and loosens once the cream goes in.
The sieve catches whatever scrambled at the bottom. There’s always a little.
Keeping the Bananas From Turning Grey
Bananas brown where a cut surface meets air. The layers press together and block most of it, which is why the top goes grey first and the buried slices stay pale.
Slice thicker — 1/4 inch rather than paper-thin, since less surface area means less browning. And tuck the banana fully under custard instead of leaving slices peeking up the side of the glass, which is the arrangement that looks best on day one and worst on day two. Tossing the slices in a little caramel first slows it further; the sugar coating cuts off the air.
Pick bananas with a few brown freckles and no green at the tip. Fully spotted ones taste better but collapse into the custard by hour four.
Why the Overnight Rest Isn’t Optional
The wafers have to go from biscuit to cake, and that takes moisture migrating out of the custard and into the cookie. Four hours gets you most of the way. Overnight gets you the texture people actually remember, where the layers have merged into something you can eat with a spoon without hitting a crunchy disc.
Beyond about 36 hours it goes the other way and the wafers turn to paste, so this isn’t a make-it-Monday-for-Friday dessert.
If you want to serve it the same afternoon, crush a third of the wafers rather than layering them whole. Crumbs hydrate in under an hour. It’s not as pretty in the glass but it’s a real fix, and it’s what I do when I’ve mistimed things — which, with a dessert this long on chilling, happens more often than I’d like. For a dessert with the same caramel logic but a hot serve, there’s sticky toffee pudding, and if you’ve got the bananas out anyway a cinnamon swirl banana bread loaf uses up the over-ripe ones this recipe rejects. Two more in the same family worth a look: an old-fashioned rice pudding for the custard practice, and a banana split when nobody has four hours to spare.