Step 1Remove the fava beans from their pods, then shuck the beans and blanch them in salted, boiling water for 4 to 5 minutes. Shock the beans in an ice bath to cool, then peel.
Step 2In a food processor, blend the favas with the tahini, olive oil, lemon juice, salt and garlic until smooth.
Step 3Spoon into a bowl and cover tightly with plastic wrap. Refrigerate; allow a few hours for the garlic to permeate the hummus. Let the hummus warm up to room temperature before serving.
Step 4Spoon into ramekins and top with Greek yogurt and a pinch of sumac.