Prepare all the ingredients
Smash the garlic cloves and mince, slice the white onion and tomatoes, remove seeds from bell pepper then dice, and roughly chop the parsley.
Cook spaghetti noodles
In a heated pan, add oil and garlic. Bring in the onions, tomatoes, and bell pepper then add canned tuna
Season with salt and pepper. Add chili flakes (optional)
Toss in cooked spaghetti noodles. Make sure to mix the pasta to incorporate all the flavors. Sprinkle some fresh parsley
Serve. Enjoy your delicious meal!