Combine yogurt, 1/4 cup sugar, and 2 teaspoons vanilla, stirring with a whisk. Set aside.
Combine berries and remaining 2 tablespoons sugar in a medium saucepan. Bring to a boil over medium heat, stirring constantly. Combine 1/4 cup water and cornstarch in a small bowl, stirring until smooth; stir into berry mixture. Cook 1 minute or until thickened. Remove from heat; stir in remaining 1 teaspoon vanilla, ginger, and lemon rind. Cover and keep warm.
Toast waffles according to package directions. Serve waffles with berry sauce and yogurt mixture.