This one is good as a sauce or a marinade - store cupboard ingredients
1 clove of garlic, crushed
3 tablespoons dry cider or wine
6 tablespoons soy sauce
1 teaspoon tomato puree
1 teaspoon mustard powder
1 tablespoon soft brown sugar
2 tablespoons honey
Tabasco
Black pepper
And a jerk marinade very similar to Iggy's, but using spices instead of a bought seasoning - so it probably ends up exactly the same

(I use this a lot, good with belly pork strips)
1 medium onion, roughly chopped
1 hot chilli, roughly chopped
3 tablespoons soy sauce
1 tablespoon oil
1 tablespoon cider or wine vinegar
2 teaspoons fresh thyme leaves
2 teaspoons sugar
1 teaspoon salt
1 teaspoon ground allspice
1 teaspoon ground black pepper
1/2 teaspoon ground nutmeg
1/2 teaspoon ground cinnamon
dash of Tabasco
I just whizz the onion and chilli in the food processor, add everything else and whizz again. You'd need to chop the onion & chilli finer if mixing by hand, obv.