Not very 'Sunday dinnerish' but warpa/fagitas?
We had my Mum [veggie) and others round for dinner:
Veg and chicken wraps
Wraps - about 2 per person
Mushrooms, peppers, tomotoes, red onion - roasted in oven with little oil and some 'fajita spice' mix (did this the day before when we had the oven on)
Some chicken [we used left overs from a roast - you could get thighs or diced....) Pan fried.
Put these in middle of the table, maybe we other bits like a salsa, guacamole, sour cream etc.
Have these all in fridge then warm up veg and wrap in microwave when you get home.. Folks can pick what they want to eat.
or
Slow cooker?
For 15 people, do something like beef in red wine with a few onions in. Cook day before or in morning then have with tagliatelli and some creme fresh or with rice or pittas?
Or do on stove and store in fridge till the dinner?
Good, cheap and easy pudding:
Tins of manderins
Whipped cream
Ginger biscuits
Cadburys flake....
Open cans of manderins and drain liquid into a bowl. Dip ginger biscuit into bowl of manderin juice then put on dollop of cream.... stack these together... Either in one big bowl or in individual bowls. Spoon on some of the manderin fruits and garnish with flake....
Very very delicoius. Can be made in the morning and popped in the fridge.
Massive Veg shepherds pie?
Squash and pine nut lasagne is delicious...
Pueanut and lentil layer type thing with panfried chicken if folks want to add that on