Ingredients
- 1 1/2 cups (180 grams) bread flour, plus more as needed
- 1 teaspoon (5 grams) kosher salt, divided
- 1/3 cup whole milk
- 1 large egg, lightly beaten
- 3 tablespoons unsalted butter, softened, divided
- 1 tablespoon neutral oil, such as canola
- 2 medium yellow onions, peeled, halved crosswise, and thinly sliced into half-moons
- 1 large (10 ounces/(300 grams) Russet or Yukon Gold potato
- 2 tablespoons mayonnaise, preferably Japanese-style like Kewpie
- Freshly ground black pepper
- 1 cup (100 grams) low-moisture mozzarella cheese, shredded
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