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Line large baking sheet with parchment paper. Mix first 3 ingredients in medium bowl. Using electric mixer, beat 1 1/2 cups sugar and butter in large bowl until fluffy. Beat in Amaretto and vanilla. Beat in eggs 1 at a time. Mix in dry ingredients. Cover and chill just until slightly firm, about 1 hour.
Preheat oven to 350°F. Sprinkle powdered sugar on work surface. Divide dough in half. Roll each half on sugar to 11-inch-long, 2 1/2-inch-wide log. Transfer logs to prepared baking sheet, spacing 3 inches apart. Bake until firm to touch, about 40 minutes. Cool slightly.
1/2 cup half-and-half cream
Whip heavy cream until firm, set aside in frige until ready to use. Wash and dry bowl really well for egg whites.
Stir constantly until it comes to a slow rolling boil. Let boil 2 minutes, still stirring constantly.
Add extract, Amaretto, and lemon juice. Mix well and set aside.
Whip egg whites until stiff (not dry)
Fold Heavy cream and egg whites into amaretto mixture in 3 alternating batches.
Chill mousse
Brush with amaretto while warm.
be sure biscotti is dry!
1 1/4 c biscotti crumbs
1/4 + c melted butter