Savory Onion Tomato Ketchup Sandwich

1.In a skillet, melt 2 tablespoons of butter over medium heat.

2.Add the finely chopped onions to the skillet and sauté until they become translucent, about 5-7 minutes.

3.Stir in the diced tomatoes and cook for another 3-4 minutes until they soften.

4.Add 1 cup of tomato ketchup, 1 teaspoon of salt, and 1 teaspoon of sugar to the skillet. Mix well and let it simmer for 5 minutes, allowing the flavors to meld together.

5.While the mixture simmers, toast the slices of bread until golden brown.

6.Once the mixture is ready, spread a generous amount on each slice of toasted bread.

7.Top with another slice of bread to create a sandwich, or serve open-faced if preferred.