Source: HowToCook (a programmer's guide)
Build this drink in layers. The coffee-pineapple base sits cold and still; the cream floats above as an aerated buffer that softens the acidity of the citrus and the bitterness of the coffee. The salt on top heightens both.
Fill a glass with 50 g ice cubes — use larger cubes if you have them, as they melt slower than crushed ice and keep dilution minimal. Pour the 30 ml coffee over the ice first; this cools the glass and prevents thermal shock when the cold juice follows. Add the 60 ml pineapple juice next, then the 30 ml sparkling water. The carbonation introduces tiny bubbles that catch light and keep the drink feeling effervescent as the ice melts. Stir once to marry the flavours — the citrus tang should cut through the coffee's roast without either dominating.
Whip the cream separately. Pour 30 ml cold cream into a bowl and whip it with a balloon whisk or electric beater at medium-high speed until soft peaks form — this takes two to three minutes by hand, less with a machine. The whisk introduces air; the aeration creates a foam structure that's light enough to float but stable enough to hold its shape. This matters: dense whipped cream would sink and separate. Once you've reached soft peaks — the cream should hold a shape but still look slightly loose — add the 8 g sugar and whip for another ten seconds. Add the 5 ml rum and the 10 ml milk together; the alcohol and milk thin the foam slightly and add flavour without breaking it. Stop as soon as you reach a flowing consistency — overshopping will split the emulsion.
Pour the cream mixture onto the surface of the drink. It should sit atop the coffee-pineapple base with minimal mixing; if you pour slowly and onto the back of a bar spoon, you'll maintain the layering. The interface between cream and base is where the flavour experience lives — the cold, bitter coffee meeting the sweet, tart citrus meeting the soft fat of the cream.
Finish by sprinkling 0.5 g sea salt over the cream layer. This is not decoration. The salt suppresses the sweetness of the cream and sharpens the pineapple, forcing your palate to work across all three flavour registers before swallowing. Serve immediately.
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