Tuna casserole with peas

I'm having minor kitchen accidents these days so I got a two piece casserole dish set as a consolation gift. In the bigger one you can cook for two people and the smaller one is enough for one. I tried the bigger dish out the next day with this tuna casserole :) 

Ingredients

• half a packet of penne 
• 1 can of peeled tomatoes
• 3 drops of liquid sweetener
• 1 onion
• 2 cloves of garlic
• 1 can of tuna (in brine)
• peas according to taste
• grated cheese
• salt, pepper

First you have to cook the penne in boiling salted water. Then chop the onion and the garlic fine and start cooking it in a saucer pan. Chop the canned tomatos up and pour it into the pan. Add some salt, pepper, a bit of water and the 2 drops of sweetener. Pour in the peas and cover it with a lid. Cook it until the peas are fine, then remove the lid and let it boil for a while so that it gets thicker. Then lay one third of the penne on the bottom of the casserole dish, then one third of the tuna and one third of the tomato sauce. Repeat this twice and sprinkle the cheese on top of it in the end. You need to cook it in the oven at 200 deg Celsius until the cheese becomes golden.