Heat a grill to high heat. Grill the jalapenos on both sides. Whisk together the vinegar and egg yolk in a bowl. Pour in the oil, whisking constantly, until emulsified. Blend the grilled jalapenos with the mayo.
NotesThis recipe was provided by a chef, restaurant or culinary professional and may have been scaled down from a bulk recipe. The Food Network Kitchens have not it for home use and therefore cannot make any representation as to the results.