**Assistant:** Sure! Here is a simple recipe for pasta with ketchup:

Ingredients:

* 1 pound pasta
* 1/2 cup ketchup
* 1/4 cup water
* 1 tablespoon olive oil
* 1/2 onion, chopped
* 1/4 teaspoon garlic powder
* 1/4 teaspoon salt
* 1/4 teaspoon black pepper
* Grated Parmesan cheese, for serving (optional)

Instructions:

1. Cook the pasta according to package directions.
2. While the pasta is cooking, heat the olive oil in a large skillet over medium heat. Add the onion and cook until softened, about 5 minutes.
3. Stir in the ketchup, water, garlic powder, salt, and pepper. Bring to a simmer and cook for 5 minutes, or until the sauce has thickened slightly.
4. Drain the pasta and add it to the skillet with the sauce. Toss to coat.
5. Serve immediately with grated Parmesan cheese, if desired.

**Prices:**

The prices of the ingredients will vary depending on your location and the grocery store you shop at. However, this is a relatively inexpensive dish to make, as the ingredients are all fairly basic and easy to find.

Here is a rough estimate of the prices of the ingredients in the recipe, based on average prices in the United States:

* 1 pound pasta: $1.00
* 1/2 cup ketchup: $0.50
* 1/4 cup water: $0.00
* 1 tablespoon olive oil: $0.10
* 1/2 onion: $0.25
* 1/4 teaspoon garlic powder: $0.02
* 1/4 teaspoon salt: $0.01
* 1/4 teaspoon black pepper: $0.01
* Grated Parmesan cheese (optional): $0.50

Total cost: $2.40

Please note that these are just estimates and the actual cost of the ingredients may vary.
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