Heat the chicken stock. This can be done on the stove top or in a microwave. You want the stock to be hot but not quite boiling.
Blend one cup of the frozen peas with one cup of the stock to make a pea puree. (if you are using a bullet type non vented blender then you should do this with cold stock)
Finely dice the onion
Cube the ham
Heat the oven to 180 degrees celsius or 350 Fahrenheit
Cook
Use a large oven proof dish that has a lid. Start by heating the oil on the stove top.
Add finely onion, garlic and ham, and sauté until the vegetables are softened and fragrant and the ham is caramelised.
Add the arborio rice and thyme, and cook for 1-2 minutes, stirring so that the rice does not catch on the bottom of the dish.
Add the pea purée and stock you heated earlier and bring to a boil.
Cover with a lid and bake in an oven at 180 degrees Celsius or 350 Fahrenheit for 20 mins.
Stir in remaining frozen peas and parmesan cheese, then return the risotto to the oven for 5 mins with the lid on.
Enjoy!
Notes
The secret to a baked risotto is about the ratio of rice to liquid. For every 250 grams of arborio rice, you need 750 mls of liquid.
Olive oil: This can be substituted for butter
Onion: this can be substituted for shallots or finely sliced leeks.
Ham: if you don't have leftover ham you can use bacon, sausage or chorizo