• Stalks should be firm and crisp. • Ensure the tips or buds are tightly closed. • Whether you choose green, white, or purple asparagus, you want bright and vibrant colors for the best results. • Asparagus comes in all shapes and sizes. Thin spears are better for stir-frying and boiling and blanching, whereas thick spears are ideal for grilling, baking, or stir-frying.