Cut sausages diagonally into thirds.

Slice onion and mushrooms thinly. Halve the bell pepper, remove seeds and stem, and slice thinly.

Boil water in a pot, add salt, and cook spaghetti 1 minute less than package instructions. Drain water.

Heat salad oil in a frying pan, add sausages, onion, and mushrooms. Stir-fry over medium-low heat until onion softens.

Add canned tomatoes, salt, pepper, ketchup, and consomme. Simmer for 5 minutes, stirring occasionally to reduce water content.