DP has unexpectedly been out of work for a few weeks so the budget is tight - it'll be me, DP and the DTs (9yo) for about two weeks before we go back to school/ work routine - I'm trying to meal plan for at least two meals per day rather than us eating out. I'm vegetarian, DTS1 has a very beige diet but DP and DTS2 will eat most things, I just don't have the headspace to work out two weeks' worth of meals for all of us 
I've never cooked a roast dinner before in my life either, we'll now be at home for Christmas and I have to decide what to cook
I've been vegetarian for years and never needed/ wanted to cook a roast - but now I think I'll need to cook something!
I'm just absolutely at a loss, I'm terrible at meal planning at the best of times and it's sending me into a panic just thinking about it, I know I need to do a big Aldi/ Lidl shop soon whilst the DC are still at school (I have an afternoon left to take off work to do it!) but am stumped as to what to actually buy. Any tips gratefully received!