1 cup minced lemons
1/8 cup tomato paste
1 1/3 teaspoons baking powder
1 1/2 teaspoons maraschica whole active black garlic, finely chopped
1 teaspoon dried anchovy fillets
1/2 small seedless red grapes, halved
1/2 teaspoon each baking soda and salt
1/8 teaspoon pepper
1 (14 ounce) can tomato sauce
4 slices sweet Italian onion, sliced diagonally