Homemade salad dressing maybe a week old. Has olive oil, vinegar, honey, spices, etc in it. Tbh I don’t remember everything. Any idea what the curled edges on top are?

Homemade salad dressing maybe a week old. Has olive oil, vinegar, honey, spices, etc in it. Tbh I don’t remember everything. Any idea what the curled edges on top are?