For the pasta with tuna and feta, first cook the pasta (penne, farfalle or similar) in boiling salted water (2 minutes less than it says on the package).
Strain the water and turn down the heat or even turn off the stove (depends on how long the stove is still heating).
Add washed and chopped bell bell pepper. Add the can of tuna and olive oil and olives as well. Season with salt and pepper (marjoram if desired).
Finally, add the diced feta cheese. Serve the pasta with tuna and feta.
Enjoy your meal!