Fresh Grapefruit Cake

This is a chiffon-style cake built on fresh grapefruit juice and zest, and it’s lighter than air. Five separated eggs, whipped whites folded into a citrus-rich yolk batter, create a crumb so tender it practically dissolves on your tongue.

The technique is what makes chiffon cakes special. The yolk batter gets mixed with oil (not butter), which keeps the cake moist and soft even after cooling. Fresh squeezed grapefruit juice and a full tablespoon of grated peel deliver a bright, slightly bitter citrus flavor that’s completely different from the usual lemon or orange cake. Cream of tartar stabilizes the whipped egg whites so they hold their volume when you fold in the heavier yolk mixture.

That folding step is where most people go wrong. Gentle, sweeping motions from the bottom of the bowl up and over. Stir too aggressively and you’ll deflate the whites, losing all the lift that makes this cake airy instead of dense.

Chef Tips

• Use fresh grapefruit only. Bottled juice is pasteurized and flat. You need the bright acidity and aromatic oils from a fresh fruit. Pink or ruby red grapefruit gives a slightly sweeter, more floral result.
• Separate eggs while cold, beat whites at room temperature. Cold eggs separate more cleanly without breaking the yolk. But room-temperature whites whip to greater volume.
• Line the pans with oiled wax paper. This cake sticks. Don’t skip the lining or you’ll leave half the cake in the pan.
• Cool 10 minutes in the pan before turning out. The structure needs time to set or it collapses.

Variations

• Grapefruit cream cheese frosting: Beat cream cheese with powdered sugar and a tablespoon of fresh grapefruit juice for a tangy frosting that complements the citrus crumb.
• Bruleed grapefruit topper: Arrange thin grapefruit segments on top, sprinkle with sugar, and torch until caramelized for a stunning presentation.