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1
Sandwich 2 1/2 tablespoons ice milk between 2 snaps, pressing snaps together gently, and put sandwich on a tray in a freezer.
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2
Form 11 more sandwiches in same manner and freeze on tray, covered, until hard.
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3
Ice-milk sandwiches may be made 1 week ahead and kept frozen, individually wrapped in plastic wrap.
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4
In a saucepan whisk together sugar and cornstarch and whisk in milk.
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5
Bring mixture to a boil over moderate heat, stirring frequently, and boil, stirring constantly, 1 minute.
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6
Remove pan from heat.
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7
In a small bowl stir about one fourth milk mixture into yolks and pour into remaining milk mixture, whisking constantly.
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8
Cook mixture over low heat, stirring constantly, until slightly thickened and a thermometer registers 160F.
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9
(Do not boil mixture or it will curdle.)
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10
Stir in creme de menthe and transfer mixture to a bowl.
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11
Chill mixture about 1 hour, or until cool.
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12
In a small heavy saucepan melt chocolate over low heat, stirring occasionally and cool slightly.
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13
Put chocolate in a small sealable plastic bag and seal bag, pressing out excess air.
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14
Squeeze chocolate to one corner of bag and snip off 1/8 inch from corner to form a makeshift pastry bag.
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15
Freeze milk mixture in an ice-cream maker and with motor running add chocolate in a thin stream during last few minutes of freezing time.
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16
In a bowl whisk together flour, sugar, cocoa powder, baking powder, and salt and with fingers blend in butter until incorporated.
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17
Stir in egg until mixture is combined well.
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18
Cover dough in bowl and chill until firm, about 1 hour.
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19
Preheat oven to 400F.
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20
and lightly grease a large baking sheet.
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21
Spoon level tablespoons of dough onto a sheet of wax paper and cut each in half.
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22
With floured hands roll each piece of dough into a ball and arrange, evenly spaced, on baking sheet.
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23
Flatten each ball with floured metal spatula into a disk about 2 inches in diameter and bake in middle of oven 7 to 8 minutes, or until cookies are set but not hard.
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24
Cool cookies on racks.
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25
(Cookies will continue to crisp as they cool.)
