Green Beans

Peak Season: April to October

Perfect Pick: Vibrant, smooth surface without any visible withering. They should "snap" when gently bent and appear moist on the inside.

Handle with Care: Refrigerate, unwashed, in an unsealed bag for up to 1 week.

The Payoff: Fiber (4 grams in 1 cup), which can reduce all-cause mortality, according to Dutch researchers.