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Weigh your flour; or measure it by gently spooning it into a cup, then sweeping off any excess.
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To make the dough: Mix and knead all of the dough ingredients — by hand, mixer, or bread machine — to make a soft, smooth dough.
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Cover the dough and let it rise until it's nearly doubled in bulk, about 1 to 2 hours.
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To shape the buns: Gently deflate the dough and divide it into eight pieces (about 100g each); to make smaller or larger buns see "tips," below. Shape each piece into a ball.
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Flatten each dough ball with the palm of your hand until it's about 3" across.
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Place the buns on a lightly greased or parchment-lined baking sheet. Cover and let rise until noticeably puffy, about an hour. Toward the end of the rising time, preheat the oven to 375°F.
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Brush the buns with about half of the melted butter. To make seeded buns, brush the egg white/water mixture right over the melted butter; it'll make the seeds adhere. Sprinkle buns with the seeds of your choice.
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To bake the buns: Bake the buns for 15 to 18 minutes, until golden. Remove them from the oven and brush with the remaining melted butter; this will give the buns a satiny, buttery crust. If you've made seeded buns apply the melted butter carefully, to avoid brushing the seeds off the buns.
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Cool the buns on a rack before slicing in half, horizontally. Use as a base for burgers (beef or plant-based) or any favorite sandwich filling.
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Storage information: Store leftover buns, well-wrapped, at room temperature for several days; freeze for longer storage.