What Is Black Garlic?

Gather the ingredients. The Spruce / Nyssa Tanner Remove any dirt from the garlic bulbs by scrubbing the bulbs gently with the rough side of a clean, unused sponge. Do not remove the cloves from the bulb and do not wash or wet the bulbs as this will disrupt the aging process. The Spruce / Nyssa Tanner Set your slow cooker or rice cooker to warm (not low). The warm setting provides just the right temperature and humidity for aging without cooking. The Spruce / Nyssa Tanner Place whole, unpeeled, scrubbed garlic bulbs into the cooker. Do not overcrowd the bulbs. Leave enough space between the bulbs so they that do not touch. Cover. The Spruce / Nyssa Tanner Allow the bulbs to sit uninterrupted on the "warm" setting until the cloves are soft and black (2 to 3 weeks). Check the slow cooker occasionally to make sure the setting is still on "warm" not "low" and that it hasn't switched off. The Spruce / Nyssa Tanner When ready, store the bulbs whole in an airtight container for up to 3 months. Squeeze out cloves, as needed. The Spruce / Nyssa Tanner