Place the flour, almonds, sugar, butter, extract and salt in a food processor. Cover and pulse until blended. Gradually add water, 1 tablespoon at a time, pulsing until mixture forms a soft dough.
Press onto the bottom and up the sides of a greased 9-in. fluted tart pan with a removable bottom. Bake at 400° for 15-20 minutes or until golden brown. Cool on a wire rack. Reduce heat to 325°.
In a small heavy saucepan over medium heat, whisk the eggs, egg yolks, sugar, lemon juice, peel and salt until blended. Add butter; cook, whisking constantly, until mixture is thickened and coats the back of a spoon. Pour into crust.
Bake for 8-10 minutes or until set. Cool on a wire rack. Refrigerate leftovers.
