FOR THE TOMATO SAUCE – 4 tablespoons olive oil – 2 garlic cloves, crushed – 5 tomatoes (large), peeled, seeded, and chopped – 1 teaspoon oregano powder – 1 teaspoon salt (or more, to taste) – ¼ teaspoon freshly-cracked black pepper (or more, to taste) FOR THE BASE – 2 cups of quick-cooking polenta – 1 cup sweet corn (or 1 can) – ⅓ cup raisins (optional) – 1 teaspoon salt – 1 tablespoon white granulated sugar – 2 tablespoons olive oil (to grease the baking pan)