Separating Eggs: While I recommend using room temperature eggs for baking, it is easier to separate the egg yolks from the egg whites when the eggs are cold (straight from the fridge). If you find it difficult to separate the eggs, you can use a small colander to catch the yolk, or you can separate the eggs first and then let them sit at room temperature for about 10-12 minutes.
Mix Gently: It’s crucial to fold the egg whites into the batter gently to prevent deflating the whipped egg whites. The air in the whipped egg whites helps lift the cake as it bakes, much like other leavening agents do.
Be Patient: Allow the cake to absorb the milk mixture for at least two hours before serving. I know waiting to eat it can be the hardest part of this recipe!
Storing: Store the cake in the refrigerator for 3-4 days. Though, it may not last that long, as this tres leches cake is just that good!
Freezing: Based on my experience as a chef, the best option is to freeze the cake before adding the frosting/topping and pouring the milk mixture over it. After many trials, I’ve learned that once the cake is drenched in the milk, it should be stored in the fridge. The cake, without the milk or frosting, can last in the freezer for up to 3 months if properly wrapped.
Baking Pan Size: We made this tres leches as a sheet cake by using a standard 9×13 baking pan. This size has tall enough sides to hold the sweet milk mixture.