Step 1

Preheat the oven to 325ºF. Beat the sugar with the almond paste until the almond paste is in fine pieces. Or, better, pulverize it in a food processor. Beat in the butter and the vanilla, then cream the mixture until it is light and fluffy. Beat in the whole eggs, one at a time — the eggs should be at room temperature — beating well after each addition so the eggs are thoroughly mixed in.

Step 2

Mix the flour, baking powder, and salt, and beat in just until thoroughly blended.

Step 3

Butter a 9-inch springform pan and turn the batter into it, smoothing the top evenly. Bake for 1 to 1¼ hours (mine baked for 1¼ hours) or until a toothpick inserted in the center comes out clean and the center feels springy when you push it gently.

Step 4

Let cool for about 20 minutes before releasing the sides of the springform pan.