When vegetables are in-season, buy them fresh and ripe. “Off-season,” frozen vegetables will give you a high concentration of nutrients.
Selecting Frozen Vegetables
Look for varieties without added seasonings, salt, fat, or sauces.
Avoid packages that are torn, thawed, water stained, or have expired use-by dates.
Eat them soon after purchase: over many months, nutrients in frozen vegetables do inevitably degrade. Steam or microwave rather than boil your produce to minimize the loss of water-soluble vitamins.