There are some pesky things in life that you can count on. You'll always pick the slowest checkout line at the grocery store. An unseasonably cold day will sweep through right after you pack away your jumpers. And you'll never use up an entire can of pasta sauce or tomato paste for one recipe.

The first two definitely fall into the category of grin-and-bear-it. But those leftovers? That's a problem with plenty of solutions. Here are 9 easy, tasty ones to try.

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