This flavorful dish makes the most of summer and late fall vegetables. Use any kind of ravioli; spinach goes well with the lamb. The ratatouille and yogurt may be prepared in advance and stored in an airtight container, refrigerated.
If you have a food processor, all ingredients can be combined (depending on the size of your food processor do this in batches) until smooth. The beans can also be ground with a masher, with the other ingredients incorporated afterward. Using a blender is not recommended. For flavor variations, you can add roasted red peppers, roasted garlic, tahini, olives, or herbs.