In a food processor add all ingredients except pumpkin seeds (and starting with 1 tbsp tahini). Puree until very smooth. Taste, and if you’d like to add addditional garlic or spices, add a little (and if you'd like a richer tahini flavor, add the other tablespoon). Then, add most of the pumpkin seeds (reserving a couple of tbsps), and pulse through. Transfer mixture to a serving dish, and top with remaining pumpkin seeds. Serve with whole-grain pita breads, tortilla chips, warm whole-grain bread, etc.