Prepare rice in boiling salted water according to package instructions. Wash the peppers. Cut a "lid" off each pepper, remove the core
Cut olives into thin rings. Wash and clean spring onions and cut them into fine rings. Crumble feta. Drain rice. Mix with olives, spring onions and feta, season with salt and pepper
Fill the peppers with the rice mixture, cover each with a "lid". Peel onions and garlic, dice finely
Heat the oil in a frying pan and fry the onions for 2-3 minutes. Add garlic and tomato paste, fry for 1-2 minutes. Add 150 ml water and tomatoes. Season with salt, pepper, sugar and dried oregano
Place the peppers in the sauce, cover and simmer at medium heat for 25-30 minutes. Remove the peppers and keep warm
Puree the sauce (dilute with a little water if necessary) and season to taste with salt, pepper and sugar. Wash fresh oregano, shake dry. Arrange peppers with sauce, garnish with fresh oregano