Green Tomato Chutney Recipe - Chili Pepper Madness How to Make Green Tomato Chutney - the Recipe Method First, heat a pot to medium heat and add all of the ingredients. Simmer, stirring often, until the mixture breaks down and becomes thick and sauce, about 20 minutes. Enjoy! Store your green tomato chutney in the refrigerator sealed in glass jars for a month or so, or freeze it for up to 3 months.