Season: Pomegranates peak from September to January.

Purchase: Pomegranates that feel heavy for their size and are hard when pressed.

Avoid: Pomegranates that are cracked, bruised or have soft spots.

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Season: Corn peaks from May to September.

Purchase: Cobs that look and feel moist and plump and are firm to the touch with bright green husks and golden- brown tassels. The kernels should be tight, fat and shiny. The silk of the corn should be slightly sticky and look glossy, stiff and moist.

Avoid: Dried or dark colored silk or discolored husks.

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Season: Spinach is available year round in supermarkets, though best during winter and spring months.

Varieties: There are two main varieties: curly (savoy spinach) and flat-leaf. Flat-leaf spinach can be broad and round, or pointed; the young leaves (baby spinach) are tender and delicate.

Purchase: If buying in bunches, look for bright green, unwilted, crisp leaves with undamaged stems. If buying pre-packaged, look for small, dry leaves that look crisp and bright green.

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Season: Though found year-round in supermarkets, raspberries peak late spring through summer.

Varieties: Besides red raspberries there are black raspberries and yellow raspberries, their flavor being similar to regular red raspberries.

Purchase: Choose deeply-colored raspberries with hollow centers that are plump, firm and fragrant. Continued over here »

Season: Spring onions peak from May to June.

Purchase: Look for bright, fresh greens that extend from the root end. Roots should be crisp and firm.

Avoid: Avoid onions with wilting, discolored, slimy, or decaying tops or roots with soft spots or brown spots.

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