Buy a slow cooker a big one. Mine allows me to make about 8-9 full meals out of it. Get in from work, put all the ingrediants in the thing with water, switch on, go back to it in the morning.
Fucking lovely stews, currys, anything with moisture.. oh and the meat melts away in your mouth.
Easy to get 1-2kgs of veggies in a week this way, just buy frozen!