Cut about 1/4" off the bottoms (non-root side) of the garlic, exposing the cloves. Drizzle with a splash of olive oil. Wrap in foil and put into the oven for about 45 minutes or until softened. Remove and let cool. Remove the roasted garlic by squeezing on the garlic bulb.
Place lemon and Tahini into a food processor and puree for 1 minute.
Scrape down the sides of the processor and puree for another 30 seconds.
Add 2 tablespoons of oil, garlic, cumin, cayenne, and salt.
Process for 30 seconds. Scrape down the sides and puree another 30 seconds.
Open the can of peas. Drain the liquid into a cup, then rinse and drain well.
Add half of the peas to the processor and run for 1 minute.
Add the remaining peas and process another 1-2 minutes or until smooth.
Add in the roasted garlic. If the mixture is too thick, add a little bit of the reserved chickpea liquid, but not much.