To make this Black Bean Hummus gluten free, serve it with certified gluten-free pita chips, gluten-free crackers, tortilla chips, or fresh vegetables instead of regular pita bread. Also check that the tahini and any packaged ingredients are labeled gluten free, since brands can vary and cross-contact is possible during manufacturing. If preparing this recipe for someone with celiac disease or severe gluten sensitivity, use clean utensils, baking sheets, and serving dishes, and avoid toasting gluten-free dippers on surfaces that have come into contact with regular bread or pita.