Peperoni is a kind of capsicum, more hot and smaller and longer than bell pepper and bigger and less hot than chili.
Peperoni, bell pepper or chili, depending on how hot you like it
Olives, green and/or black
A little bit salt and sugar
Cut the tomatoes in slices, same with the peperonis, olives.
Cut the feta cheese in cubes, 5-10 millimeter size.
Add olive oil, vinegar, salt and sugar, mix well all together in a bowl and let the salad sit for 30-60 minutes at a cool place.