Chop all your ingredients and your garlic.

In a big pan, put some butter and stir your chopped onions until almost golden.

Add your mushrooms and green beans and stir.

Add some salt and pepper, and soy sauce. Leave for a bit covered.

Give it all a last stir and it's ready.

If you like, you can add tomatoes. Also chopped but put it in last minute so as not to get too soggy.