Rosemary leaf is an aromatic herb commonly used as a spice in cooking. It has needle-like leaves that are dark green and have a pungent, pine-like fragrance. The flavor of rosemary is strong, woody, and slightly bitter, with hints of citrus and camphor. It adds a distinct and robust taste to dishes and is often used to season roasted meats, potatoes, soups, and sauces. Rosemary is also a popular herb for infusing oils and vinegars, and its dried leaves can be crushed or ground before use.