Tomato and Horseradish Sauce Recipe

Ingredients

• 1 tablespoon olive oil
• 1 tablespoon butter
• 1/2 cup finely chopped onion
• 1/2 teaspoon finely minced garlic
• 1 tablespoon red-wine vinegar
• 3 cups red, ripe tomatoes cut into 1/2-inch cubes, about 3 cups
• Salt to taste if desired
• Freshly ground pepper to taste
• 2 tablespoons freshly grated or bottled horseradish