Coconut Macaroon Sandwiches with Lime Curd

Macaroons:

• 1 (14-ounce) bag (5 1/3 cups) sweetened flaked coconut
• 1/2 cup sugar
• 1/2 cup all-purpose flour
• 1/4 teaspoon salt
• 4 large egg whites
• 1/4 teaspoon pure almond extract

Lime Curd:

• 1 tablespoon lime zest
• 3/4 cup fresh lime juice (from about 6 limes)
• 3/4 cup sugar
• 2 1/2 tablespoons cornstarch
• 1/2 teaspoon salt
• 1 stick (1/2 cup) unsalted butter, cut into pieces
• 4 large egg yolks
• 1 drop green food coloring, if desired

Garnish:

• Edible gold or silver glitter or clear sanding sugar (optional)