Notes: Cremona fruit in mustard syrup is available at Italian food markets and upscale delicatessens. Instead of making the pasta (steps 2 and 3), you can use 48 to 50 gyoza (Japanese equivalent to potstickers) skins; moisten edges with water and press with fingers to seal. Do not dry (step 4); drape with plastic wrap as shaped. Cook filled gyoza only 2 to 3 minutes (step 5). If filling pasta or gyoza skins up to 1 day ahead, chill airtight; freeze up to 6 weeks. Or purchase about 3 pounds cheese-filled ravioli and serve with the sauce.