Braising/Roasting Liquids -- They can be frozen and reused for next week's meat, turned into a tasty gravy or slipped into a soup as a flavor boost.Cooking Water -- Instead of dumping nutrient-rich water after boiling it, save it for plants! Those who don't own plants can use vegetable-laced H2O to cook grains (amping up their flavor) or check out other great ideas like saving water for stock or bread-making.
Oils -- Even if you don't have a veg-oil-using vehicle kicking around it's OK to reuse oil (being sure it doesn't turn rancid.)
Heck, some recipe liquids even get better with age, like this one by the Minimalist for Poached Chicken.
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