Similar such combinations , both in and out of the French culinary repertoire , sometimes include leeks , parsnips , garlic , tomatoes , shallots , mushrooms , bell peppers , chilies , and ginger . Similar combinations , both in and out of the French culinary repertoire , may include leeks , parsnips , garlic , tomatoes , shallots , mushrooms , bell peppers , chilies , and ginger , according to the requirements of the regional cuisine or the instructions of the particular chef or recipe .