Walnuts are edible tree nuts often sold raw or roasted, either shelled or in-shell. They provide omega-3 fatty acids, protein, and fiber. Use chopped walnuts in baked goods, granola, salads, pesto, and savory dishes, or enjoy them as a snack. Store in a cool, dry place or refrigerate to maintain freshness and prevent rancidity. Best consumed within weeks of opening for optimal flavor.