Rainbow Cookies

Ingredients

• 2 large eggs
• 2/3 cup plus 2 Tablespoons granulated sugar
• Zest of 1 lemon
• 2 1/2 sticks unsalted butter, softened
• 1/2 teaspoon salt
• 1 teaspoon vanilla extract
• 3 cups all-purpose flour
• 1 egg white, lightly beaten
• food coloring

Directions

In a large bowl, cream together the butter, sugar, vanilla, and lemon zest. Gradually mix in the flour and salt, alternating with the eggs, until smooth and well combined. Divide the dough into 6 equal portions and color each with food coloring to make red, orange, yellow, green, blue, and purple. Mix until the coloring is well distributed.Roll each portion, on a piece of plastic wrap, into a long strip about 3 inches wide, 11 inches long, and 1/4-inch thick. Wrap each strip with the plastic wrap and chill until firm, about an hour.

Heat the oven to 350° F. Place purple dough on a cutting board and brush with egg white. Place blue dough on top of purple and brush with egg white. Repeat with remaining dough in the order of green, yellow, orange and red. Using a chef's knife, trim the edges and slice the dough into 1/4-inch thick rectangles. Place the cookies 1 inch apart on a lined baking sheet. Bake 14-16 minutes.