We’ve all been there: Almost-empty jars of jam or gifted artisanal fruit butters lurk in the back of the refrigerator, because “I was saving the last bit for you.” The roasted vegetables from last Sunday’s farmers market haul no longer excite. The rotisserie chicken you grabbed from the grocery store looks as if a horde of angry vultures descended on it.

The carton of french fries you took home “because maybe they’ll re-crisp in the oven” is getting pushed farther and farther back, out of sight and out of mind. Or, the worst, you open the refrigerator door and out tumbles half of a formerly juicy lemon, taking with it the tiny Polish teacup that was housing it, which promptly shatters on the floor.

By keeping a few things in mind, you can save your leftovers, your sanity and your teacups. Of course, you can easily reheat most. Often, though, you want something different, without starting from scratch. Repurposing your leftovers means a lot of the work is already done: You just have to mix them together.

See our accompanying chart as a jumping-off point. Dig into the depths of your refrigerator and freezer, crack open that languishing takeout, and gather your oils and vinegars. We’ve got work to do.

A few guidelines

1. Keep it safe. Check that your leftovers are still safe to eat, and adhere to basic food safety guidelines. Store leftovers for three to four days in the refrigerator. (Labeling containers with contents and date of preparation helps.) If the food smells off, or if you are at all in doubt, then play it safe and throw it out.

2. Taste, adjust. Repeat. Taste as you go, remembering that balance is key. If flavors are flat, add something acidic to brighten. Be generous with salt, pepper and other seasonings.

3. Consider textures. Dressed green salads puree nicely into soups, but they don’t stand alone equally well. (Beware of slime.) Leftovers can dry out, so be ready with sauces, broths or vinegar to add moisture and flavor.

4. Carbohydrates are powerful. We are hard-pressed to think of any leftover that wouldn’t work in a sandwich, wrap, taco, crepe or dumpling; most foods can top toast, pizza, rice or other grains. And, of course, most anything can go into fried rice.

5. Think about flavor affinities. Leftovers scented with cumin? Add curry powder. Vegetables roasted with herbes de Provence? Sprinkle in ground sumac.

6. It’s okay if you don’t like it. Not all experiments end in tasty revelations, but you’ll most likely still have something edible; try something different next time.

Recommended reading

For more leftover inspiration, we suggest flipping through Love Your Leftovers, by Hugh Fearnley-Whittingstall; An Everlasting Meal: Cooking With Economy and Grace, by Tamar Adler; The Flavor Bible: The Essential Guide to Culinary Creativity, Based on the Wisdom of America’s Most Imaginative Chefs, by Karen Page and Andrew Dornenburg; and NOPI: The Cookbook, by Yotam Ottolenghi and Ramael Scully, where we got the idea to make croquettes from shredded meat.