Pates and terrines are actually really easy and can look impressive. Here's one that I stole from James martin.
2 packets of streaky bacon
2 packets of 'nice' sausages - different types so maybe Cumberland and pork.
1 pack chicken livers (usually in the freezer of the supermarket)
a chicken breast chopped or you can get 'mini fillets.
salt and pepper and any dried herbs you have in the cupboard
1 loaf tin
a couple of weights / heavy tins.
Line the loaf tin with the bacon.
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Take a sausage, split it, take off the skin, throw the skin away and make the sausage in to a patty and press in to the lined tin.
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Do the same with a different sausage, then throw in a chicken liver or a bit of chicken, season.
repeat 1 and 2 until the tin is full and then put more bacon on top so the terrine is completely wrapped.
Put in the oven for 30 mins at 200 deg c
When it comes out of the oven there will be quite a lot of fat that has come out - don't worry about it, put some foil or a foil lid or Tupperware and put weights on top, this will press the liquid fat out and make the terrine more solid.
After an hour or two you can remove it from the loaf tin, it will look impressive.
You can do this a day or two before so no hassle on the day, in fact you can do it a week before and freeze it.
Main - I'd do a one pot stew/casserole.
Pudding - er - I'm not a big pud fan but jam roly poly is underestimated and easy.