If a recipe does not specify a type of mint, then the choice is up to you. Your choice will affect the flavor of the dish, but either one will work. For recipes that call for fresh mint, spearmint is more likely to be what the author intended. After all, spearmint is the variety most commonly sold fresh in grocery stores. Understanding the differences between spearmint and peppermint can help you choose the mint that best complements the recipes and suits your preferences.