Chocolate Yule Log - Ohio Eggs

Ingredients

• 6 egg whites, room temperature
• 3/4 tsp. cream of tartar
• 2/3 cup granulated sugar, divided
• 6 egg yolks, room temperature
• 1/2 tsp. almond extract
• 1/2 tsp. vanilla
• 1/4 tsp. salt
• 1/2 cup ground almonds (2 oz.)
• 1/4 cup all-purpose flour
• Chocolate buttercream frosting
• 1/2 cup granulated sugar
• 1/2 cup water
• 1 tbsp. almond-flavored liqueur, optional