Soak red chilies and coriander seeds in warm water for at least 30 minutes. Drain and add to the blender along with garlic, lemon juice, salt, sugar, tomato and cilantro leaves.
Grind to a smooth paste with little water. Do not add too much water, the water in tomato is usually enough to get a smooth paste.
Heat the mustard oil in a small saucepan until hot. Turn off the heat and add the ground garlic mixture. Mix well and let cool. Store in an airtight container in the refrigerator for up to 10 days. Here I made some jowar (and atta) rotis and served the chutney with it.