Prepare the chana dal - rinse the chana dal under cold water, then place in a bowl.
Soak the chana dal - cover the chana dal with cold water. Leave to soak for 8 to 12 hours or overnight.
Cook the chana dal - drain and rinse the chana dal and place in a saucepan with enough water to cover them by a few inches. Bring to a boil, then reduce heat and simmer for about 40-50 minutes, or until the chickpeas are tender but not mushy. Drain and leave to cool.
Add ingredients to the processor - in a food processor, combine the cooked chana dal, minced garlic, cumin, lemon juice, salt, tahini, and olive oil.
Blend - process the mixture until smooth, scraping down the sides of the food processor as needed. If the hummus seems too thick, you can add a little ice cold water, a tablespoon at a time, until you reach your desired consistency.
Taste - adjust seasoning as needed, adding more salt or lemon juice if desired.
Serve - Transfer the hummus to a serving bowl and drizzle with a bit of extra virgin olive oil. You can also garnish with a sprinkle of cumin or chopped fresh herbs, if desired. Enjoy!