Slice onion, bell pepper, and sausage thinly.
Boil the rice noodles in boiling water for 3 minutes, then rinse in cold water.
Heat olive oil in a pan and sauté the onion, bell pepper, and sausage.
Add tomato ketchup, a little soy sauce, and pepper, and stir-fry together.
Add the cooked rice noodles and quickly mix and stir-fry.
Serve the finished pasta on a plate.