From all kinds of marinades for meat-to-be-grilled the simplest and the most favourite one of mine is
Onion juice marinade.
3-4 lbs onions
whole and freshly ground pepper
salt
Peel and juice onions, add other ingredients (i sometimes add other favourite herbs and spices, 1 small bay leaf), stir and cover prepared for marinating meat (washed, dried with a towel and cut). Cover. Let stand for 2 hours in a cool place or refrigerate overnight (you may put onion rings on top of meat making an additional cover.
Onion juice preserves meat and you can keep it uncooked refrigerated for up to 3 days in this marinade.
The recipe is good not only for pork. I use it for beef and chicken also. Chicken is ready to cook within 1 hour.
Another marinade i like to use is a
buttermilk marinade.
2-3 medium onions (cut into rings)
1-2 cups light buttermilk (quantity depends on qty of meat)
salt, ground pepper, curry & chili powder, bay leaf
Combine all ingredients, add meat, cover. Refrigerate overnight or let stand 2-3 hours in 65-70F.