Carefully transfer risen pretzels to boiling water with a spatula and boil on one side for 2 minutes, flip and boil other side for 1.5 minutes. Transfer boiled pretzels to a rack to drain for 1 minute. Arrange pretzels on a baking sheet, lightly dusted with cornmeal, and sprinkle with kosher salt. Bake for 20 minutes until golden brown.