Yield: Serves 8
Preheat oven to 400 F.
Grease a 9" square baking pan.
To prepare topping:
Combine tomatoes, olives, 1/4 cup of the green onions, basil, vinegar, 1/2 teaspoon salt, pepper and a pinch of sugar. Stir to mix. Cover and let stand for flavors to blend.
In a large bowl, stir flour, cornmeal, baking powder, the remaining 1/2 teaspoon salt and 3 tablespoons sugar until blended. Add remaining 1/4 cup green onion and garlic, stirring to blend.
Make a well in center; add the egg, oil and milk, stirring quickly, just to moisten the dry ingredients. Do not overmix. Spread batter in the prepared pan. Bake until golden, about 20 minutes. Cool then cut into 8 rectangles.
Split each rectangle horizontally in half. Place bottom half on a plate. Spread 1 tablespoon sour cream on cut side of rectangle. Spoon about 1/4 cup tomato mixture over sour cream. Top with remaining half of rectangle; spoon 1/4 cup tomato mixture and a dollop of sour cream over top. Repeat with remaining 7 rectangles.
Please note that some ingredients and brands may not be available in every store.