Lemon Macarons

Ingredients

• 1 cup (100gr) almond flour
• 3/4 cup (100gr) powdered sugar
• 2 large egg whites (about 70gr)
• ¼ teaspoon cream of tartar
• ¼ cup (50gr) sugar
• 1 teaspoon lemon zest
• ½ teaspoon pure vanilla extract
• ½ teaspoon lemon juice
• Yellow gel food coloring
• 3 tablespoons (40gr) unsalted butter, softened
• 1 cup (130gr) powdered sugar
• 2 teaspoons heavy cream
• 1 tablespoon lemon juice
• 1/8 teaspoon salt