In a blender or food processor, blend together the tahini and lemon juice until smooth.
Add the drained canned chickpeas, olive oil, minced garlic, lemon zest, and sea salt. Blend until it reaches the consistency you like in hummus.
If the hummus seems too thick or the food processor struggles to blend it, gradually add a spoonful of cold water or olive oil until the hummus blends smoothly and reaches the right consistency.
Transfer to a serving bowl. Sprinkle cumin on top, if desired.
Serve with crackers, pita wedges, or raw veggies.