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1
If using ramekins, line each with plastic wrap, allowing a 2-inch overhang.
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2
In a very small bowl sprinkle gelatin over cold water to soften.
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3
In a bowl with a fork beat yolks until smooth.
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4
In a saucepan simmer zest, lemon juice, and 1/3 cup sugar over moderate heat, stirring, until sugar is dissolved and whisk half of lemon mixture in a slow stream into yolks.
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5
Transfer yolk mixture to remaining lemon mixture and cook over moderate heat, stirring constantly, until it is thickened and just begins to simmer.
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6
Pour mixture through a fine sieve into a large bowl and add gelatin mixture and vanilla, stirring until gelatin is dissolved.
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7
Cool lemon mixture to room temperature.
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8
In a bowl with an electric mixer beat together whites (or reconstituted dried egg whites) and cream of tartar until meringue just holds soft peaks.
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9
Gradually beat in remaining 1/3 cup sugar until meringue just holds stiff peaks.
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10
In a bowl with electric mixer beat cream until it just holds stiff peaks.
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11
Stir one third meringue into lemon mixture to lighten and fold in remaining meringue and whipped cream gently but thoroughly.
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12
Spoon mousse into foil molds or lined ramekins.
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13
Chill mousses until set, about 4 hours, and freeze set mousses, covered with plastic wrap, until frozen, about 4 hours, and up to 2 days.
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14
Spoon some sauce onto 4 dessert plates, tilting plates to coat.
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15
If using foil molds, cut tape on cylinders and gently unwrap mousses, arranging 1 on each plate.
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16
If using ramekins, remove mousses, using plastic wrap overhang to lift them out, and invert onto plates.
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17
Gently remove plastic wrap.
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18
Garnish desserts with mint.
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19
Tear off 4 12- by 8-inch sheets of foil.
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20
Fold each sheet lengthwise into a 12- by 2 1/4-inch strip (about 3 layers thick) and trim each strip to 10 inches in length.
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21
Wrap 1 strip, smooth side in, around base of a bottle or glass that is 2 1/4 to 2 1/2 inches in diameter and tape overlapping end of strip at top and bottom of cylinder.
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22
Gently slide cylinder off bottle or glass.
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23
Create 3 more cylinders with remaining foil strips in same manner.
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24
On a small baking sheet stand cylinders on 1 end and tape each to baking sheet in 2 places to prevent them from moving while being filled.