So Cheatin' veg soup - you will need: a blender, a tin of kidney beans, a tin of ratatouille, a way of heating the resulting soup, and a spoon. Spicy and satisfying x
My other favourite is to use the leftover gammon bits and roasted onion from stewed/roasted joint in a slow cooker along with a couple of carrots and a good handful of lentils or split peas.