Nagasaki-Style Honey Castella Cake with Dark Caramel Crust
A tall, fine-grained honey sponge bakes beneath castella's signature dark top, then rests overnight for clean slices and a supple crumb.
Baking
A buttery coarse-semolina cake bakes around toasted pine nuts, then drinks in a bright lemon syrup for crisp edges and a tender center.
Combine 1 cup sugar and the water in a small saucepan. Bring to a boil, stirring only until dissolved, then simmer 8 minutes. Add lemon juice and simmer 2 minutes more. Remove from heat, stir in optional orange blossom water and cool completely.
Heat the oven to 350°F with a rack in the center. Butter a 9-by-13-inch metal pan thoroughly, including the corners.
Whisk semolina, coconut, baking powder, salt and the remaining 1/2 cup sugar. Stir in melted butter until every grain is coated, then fold in yogurt, milk and vanilla just until evenly moistened. Do not beat.
Spread batter evenly in the pan and smooth without compacting. Rest 15 minutes so semolina begins hydrating. Score into 16 squares, cutting about halfway down, and press 2 or 3 pine nuts into the center of each square.
Bake 35 to 40 minutes until the top is an even deep gold, the edges pull slightly from the pan and the center reaches about 205°F. If needed, broil 30 to 60 seconds for color while watching continuously.
Set the hot pan on a rack. Slowly pour the cool syrup over the entire surface, including the edges and score lines. It should sizzle and absorb; pause between additions rather than flooding one spot.
Cool at least 60 minutes, then recut the squares fully. Lift three golden pieces onto a white plate with the pine nuts visible, matching the photograph. Serve at room temperature so the syrup is evenly distributed.
Useful kitchen gear
Compare the function and specifications first; skip anything your kitchen already handles well.
Cover the cooled cake tightly and keep at cool room temperature for up to 2 days or refrigerate for up to 5 days. Bring chilled pieces to room temperature before serving. Freeze individual squares for up to 2 months, thaw wrapped in the refrigerator and then uncover at room temperature.
It may have been overbaked, made with fine semolina or given too little syrup. Pull it near 205°F and pour the full cooled syrup slowly over the cake while it is hot.
Overmixing, using fine semolina or pouring hot syrup over hot cake can make the center heavy. Stir only until combined and cool the syrup before baking.
Yes. Its flavor and syrup distribution improve after several hours. Cool fully, cover the pan and cut along the score lines just before serving.