Get yourself a slow cooker!
If you're out all day, just bung some fresh meat and veggies in the cooker and leave it on all day...when you come home, 'voila!'
It's dead easy, and ideal if you're not really in to cooking.
You can pick one up for �30-40 quid easily. Just stick some shin beef, carrots, onions, potato, maybe some herbs, and a load of red wine or stock into the cooker and leave it all day. It keeps all the nutrients in the liquor too, so it's good and nutritious!