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1
Preheat the oven to 350 degrees F. Make the cake: Brush a rimmed 11-by-17-inch baking sheet with vegetable oil and line with parchment paper.
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2
Oil the parchment and dust with potato starch, tapping out any excess.
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3
Spread the coconut on a separate baking sheet; bake until lightly toasted, about 8 minutes.
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4
Let cool.
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5
Finely grind all but 1/4 cup coconut in a food processor; add the matzo meal and process until finely ground.
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6
Transfer to a large bowl and stir in the potato starch and salt.
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7
Combine 1/4 cup vegetable oil with the lemon zest and juice in a bowl; set aside.
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8
Put the eggs in their shells in a bowl and cover with hot tap water; let stand 5 minutes.
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9
Crack the eggs into a bowl; add the granulated sugar and beat with a mixer on medium-low speed until combined, 1 minute.
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10
Increase the speed to medium high and beat until thick and fluffy, 12 minutes.
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11
Fold the egg mixture into the matzo meal mixture with a rubber spatula until combined.
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12
Stir in the lemon-oil mixture until just combined.
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13
Spread the batter on the baking sheet; bake until the cake is golden and springs back when pressed, 18 to 20 minutes.
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14
Transfer to a rack and let cool 5 minutes in the pan; run a knife around the edge of the cake to loosen.
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15
Dust a kitchen towel with confectioners' sugar and invert the cake onto the towel.
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16
Peel off the parchment.
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17
Starting with a long side, carefully roll up the cake, using the towel to help you.
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18
Wrap the towel tightly around the rolled cake and let cool completely, about 15 minutes.
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19
Make the frosting: Put the egg whites, granulated sugar, lemon zest and juice, and salt in a heatproof bowl.
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20
Set the bowl over a saucepan of simmering water (do not let the bowl touch the water); whisk until the sugar is dissolved, 3 minutes.
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21
Remove the bowl from the pan and beat with a mixer on medium-high speed until thick, glossy and cool, 3 to 5 minutes.
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22
Assemble the cake: Unroll the cooled cake and spread with the raspberry jam.
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23
Reroll the cake, cover with the frosting and top with the reserved 1/4 cup coconut.
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24
Serve with raspberries.
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25
Photograph by Con Poulos