Supper with Stella

Ingredients

• 4 eggs, room temperature, divided
• 1/2 cup sugar
• 1/4 tsp. cream of tartar
• 1/2 tsp. vanilla
• 1 cup flour
• powdered sugar, for sprinkling
• 3 large egg yolks, at room temperature
• 1/4 cup granulated sugar
• 8 oz. mascarpone, softened
• 1/2 tsp. vanilla extract
• 1 cup heavy cream, cold
• 1 cup strong espresso or coffee (espresso preferred)
• 1/4 cup dark rum
• 2-3 Tbsp. cocoa powder