Empty the 15 oz. can of white beans into a colander, rinse well with cold water, and let drain at least 5 minutes; shake the colander to remove excess water and/or pat beans lightly if needed.
Wash the 20 basil leaves and dry them (salad spinner or paper towels). Add the basil to the food processor and pulse until roughly chopped.
Add the drained white beans, 1 1/2 T fresh lemon juice (or more to taste), 1/4 cup Tahini sauce, and 2 tsp. minced garlic (or more to taste) to the food processor. Process until the mixture is smooth and well pureed, about 1 minute.
With the processor running, add the 2 T olive oil through the feed tube in a slow stream (about 1 T at a time) until fully incorporated.
Taste and adjust: add additional lemon juice if desired, then season with salt and fresh ground black pepper to taste. Pulse a few times to blend the seasoning.
Transfer the hummus to a serving bowl. Drizzle additional olive oil on top if desired and garnish with additional basil leaves if you like.
Serve with pita, vegetables, or crackers.