This is going to sound incredibly "holier-than-thou" but whilst our youngest who lives on the other side of the country has been on maternity leave, I spend half a day during my visits batch-preparing meals for their freezer. I use our own home-grown veg, fruit and herbs where possible and the end-product of about thirty or forty 'ready-meals for two' is something they both really appreciate. Especially my dear son-in-law.
I really enjoy doing it - and they eat nutritional meals with no hidden ingredients that work out very cheaply indeed. They just add carrots, broccoli, cabbage and rice/potatoes/pasta on the night with a yoghurt to follow.
Favourites include lasagne and Bolognese sauce of course, but also beef and vegetable casserole, using the excellent 'skirt' cut from Tescos, pork casserole using shoulder etc. etc. but am always on the look out for new recipes - so will keep watching this space!
Hope Justine can re-ignite an interest in batch cooking with today's young Mums as time, budget and ingredients-wise it is SO sensible - half a day once a month gives you shelves and shelves of meals that if left to defrost before work, can provide a quick evening meal with no messy preparation.