Tres Leches Cake

Method

1. prep3 min
   oven at 350F
   butter a small 6-inch pan or two wide ramekins and line the base — the cake gets soaked in the pan it bakes in, so it must hold liquid without leaking
2. whisk6 min
   high speed
   egg yolks + 6 tbsp of the sugar, until pale and thick enough to fall in a ribbon that sits on the surface for three seconds — this ribbon stage is dissolved sugar holding air in the yolk protein, and it is half the lift
3. whisk2 min
   low speed
   + milk + 0.5 tsp vanilla, then fold in flour + baking powder + salt just until no dry streaks show; flour developed past that point makes a chewy crumb that resists liquid
4. whisk4 min
   clean bowl, medium-high
   egg whites to soft peaks, then + remaining 2 tbsp sugar and whip only until the peak bends over at the tip — whipped to dry, stiff peaks the foam has no stretch left, it tears during folding, and the cake bakes tight and refuses the soak
5. fold2 min
   by hand, spatula
   whites into the yolk batter in three additions, cutting down and sweeping up around the bowl — count the strokes and stop while it still looks marbled; every deflated bubble is a pore that will not be there to drink the milk
6. bake25 min
   350F, center rack
   until the top springs back and a skewer comes out clean; there is no fat in this batter, so it goes from set to dry fast and an overbaked sponge sheds the soak instead of holding it
7. rest35 min
   in the pan, on a rack
   cool completely — a warm sponge is still setting its starch and will slump into a wet seam under the weight of the milks
8. mix3 min
   room temperature
   evaporated milk + sweetened condensed milk + 0.25 cup of the heavy cream + rum, whisked smooth = the three milks; the condensed milk is thick enough to sit on top unmixed and soak in stripes if you skip this
9. cook6 min
   cake at room temperature
   pierce the cake to the base every half inch with a skewer, then pour the milks over in three passes, waiting for each to sink before the next — poured all at once it pools at the edges and floods the rim while the center stays dry
10. rest240 min
    covered, refrigerated
    the soak has to travel; four hours is when the crumb is uniformly saturated and firm enough to cut, and overnight is better. Any liquid still loose in the pan at this point means the sponge was overbaked and has stopped accepting it
11. whisk4 min
    cold bowl, cold cream
    remaining 0.5 cup heavy cream + 0.5 tsp vanilla to soft peaks — warm cream will not hold, and cream taken to stiff peaks over a soaked cake reads as greasy against the wet crumb
12. top2 min
    chilled
    spread the whipped cream to the edges to seal the surface + dust with cinnamon; serve cold, straight from the pan