Place 18 paper cups in muffin pans. Place all cupcake ingredients in large bowl, beat with electric mixer until smooth and pale, about 2-3 minutes. Spoon batter into cups. Bake 20 minutes. Remove pans from oven and cool 5 minutes. Remove cupcakes and cool on rack.
For filling, combine ingredients in small bowl. Remove top from each cupcake and hollow out small hole. Spoon filling into hole and replace top.
For meringue, beat eggs and cream of tarter until soft peaks form. Add one third of sugar and beat 1 minute. Repeat until all sugar is added. Increase oven temperature to 450. Spoon or pipe meringue on top of the cupcakes. Bake 5 minutes until golden. Store no more than one day in airtight container.