A fixture at Vietnamese restaurants, sriracha sauce can lace aromatic pho with a jolt of heat. It’s the star ingredient in spicy mayonnaise zigzagging countless sushi rolls, and it has even inspired a legion of fans to dress up for Halloween each year like a red plastic squeeze bottle with green cap.
But this year, a shortage of red jalapeño chiles has threatened it all for sriracha, a beloved condiment made from sun-ripened peppers from…