By Williams Sonoma Test Kitchen
What started as salted caramel candies in Brittany has blossomed into a mini industry of salted caramel–flavored ice cream, sauce, cakes, and now doughnuts. Fleur de sel or Maldon sea salt is a good choice here.
Make the vanilla doughnut dough and knead. Roll it out to ½-inch thickness, cut out doughnuts and holes, and refrigerate.
Meanwhile, in a saucepan, stir together the sugar, lemon juice, and ¼ cup water