Suprisingly Tomato puree really livens up stewsand casseroles. And I use Worcester sauce. In fact none of my stews, soups or curries ever turn out the same. I'm an experimenter! I would be adding spinach and peas too and garlic.
I always have a bottle of Levi Roots reggae reggae sauce in the cupboard too, when I think 'hmm that needs a little something' I add a few splashes of that