Italian leftovers stew

I just improvised this, based on a vague memory of something Mum cooked once. It's very yummy.

Leftover stew for 2

2 chicken fillets
4 rashers bacon
Spinach (about 500g, fresh)
Mushrooms (various sizes and types, I think I used 3 portobello and a handful of button mushrooms)
1 tin chopped tomatoes
About half a jar of pesto
1 onion
A couple of cloves of garlic

1. Cook the chicken in olive oil until it's sealed, and add the chopped onion and crushed garlic.
2. Add the bacon and mushrooms, with a bit of pesto, and simmer for 5-10 minutes.
3. Add the tomatoes, fresh herbs and black pepper and simmer for a further 10 minutes.
4. Serve with pasta.