Omelet Tuna Onion

Omelet Tuna Onion Materials: * 5 tablespoons cooking oil mas Key * 2 pcs onions, thinly sliced * 150 grams of cooked tuna, Suwir-Suwir * 1 red chilli, seeded and roughly chopped * 1 stalk celery, finely chopped * 1 teasp...