Store duck breasts in your freezer until you're ready to use them, then thaw only as many as you need.
Duck breasts are most commonly roasted after first having much of their fat rendered off. Rendering the fat not only crisps the skin delightfully, but it imparts more flavor and moisture to the meat. Though many people find this step intimidating it is actually quite easy with the right technique and a little patience. See How to Render Duck Fat for step by step instructions.
You will end up with a lot more duck fat then you need to cook the breasts, and it can be saved for later use as an alternative to cooking oil or butter. In fact, rendered duck fat is so delicious that it’s sold separately!
Duck breasts are very versatile, pairing well with a wide variety of other flavors. Ingredients often used with duck include apples, ginger, Szechuan peppercorns, lemon juice, soy sauce, wild mushrooms, oranges, rich & fruity red wines, green onions, spicy chilies, honey, cilantro, star anise, thyme and berries. It can be served sweet, savory, tangy, smoked or spicy.