Heat oven to 375. Grease 10 inch tart pan with removable bottom or 8 inch square pan. In small bowl, beat 1/2 cup of sugar and 2 eggs; stir in lemon peel, yogurt and 3 T. butter. Add flour, baking powder and salt to egg mixture; blend well. Pour into greased pan. Arrange apple slices on top of dough, overlapping slightly. Sprinkle with 2 T. sugar and the almonds.
Bake at 375 for 35-45 minutes or until golden brown and toothpick comes out clean.
Meanwhile, in small bowl, combine all glaze ingredients; blend well. Slowly pour over almonds and allow mixture to soak into hot cake. Broil 5 to 6 minutes from heat for 1 to 2 minutes or until bubbly. Serve warm. Store in refrigerator.