Serving as a luscious, umami sauce for pan-fried potstickers, peanut sauce yet again proves itself to be the hero of weeknight cooking. The sauce needs no cooking, just some hot water to soften the peanut butter, which also helps the sauce come together smoothly. By design, it is slightly runnier than usual, allowing it to casually drape over the dumplings. Right after whisking, the sauce may look too loose, but let it sit for a few minutes as it relaxes and thickens into the perfect…