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1
Put oven rack in middle position and preheat oven to 350u00b0F. Generously butter molds and put on a baking sheet.
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2
Whisk together flour, baking powder, zest, and salt.
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3
Beat together butter and sugar with an electric mixer at high speed until pale and fluffy, about 2 minutes. Beat in egg and vanilla until just incorporated. Add milk and beat until just combined (mixture will appear curdled). Reduce speed to low, then add flour mixture in 3 batches, beating until just combined after each addition.
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4
Divide batter among molds, filling each mold about two-thirds full. Bake until edges of cakes are golden and a wooden pick inserted in center of a cake comes out clean, about 25 minutes. Cool cakes in molds on a rack 5 minutes, then turn out onto rack and cool completely.
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5
While cakes cool, pulse 1/2 cup each of raspberries, blueberries, blackberries, and strawberries (all together) with 2 tablespoons superfine sugar in a food processor until fruit is just crushed. Chill, covered, up to 2 hours.
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6
Beat cream with remaining tablespoon superfine sugar using cleaned beaters at medium-high speed until it just forms soft peaks. Chill, covered, until ready to serve (but no longer than 2 hours).
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7
Arrange cakes upside down on 6 plates and top each with 2 rounded tablespoons whipped cream and 1 rounded tablespoon crushed berries. Scatter remaining whole berries over top and serve remaining crushed berries on the side.
