There are many, many flavors of mint out there...when a recipe (like a mint pesto to be served with lamb chops) calls for mint, do they usually want peppermint, spearmint etcc.... There's chocolate and lemon and lots others. General rule?
Jennifer Colliau, bartender at San Francisco's Heaven's Dog and owner of Small Hand Foods, loves using mint in her drinks, but she warns home bartenders against using wooden muddlers with this delicate herb. Use a spoon instead, lest you end up with a drink that tastes like toothpaste. This tip will come in handy when you're making your next Mojito.