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1
Preheat a grill or a grill pan to medium high. Season the meat with salt and pepper; mix very lightly. Shape into 4 patties, and place them on the hot grill. Cook 4 to 6 minutes per side for rare, and 9 to 11 minutes for well done. Serve on warm or toasted buns, topped with lettuce, tomato, and ketchup.
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2
Place the warm water, dry milk, butter, and sugar in a large mixing bowl, and stir to combine. Sprinkle the yeast over the mixture, whisk, and let stand until yeast is foamy, about 10 minutes.
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3
Add egg, 1 egg yolk, 2 cups flour, and salt; whisk until smooth. Add 2 1/2 cups flour; stir with a wooden. spoon. When mixture becomes too thick to stir, use your hands. Add up to another 1/2 cup flour until dough is tacky when pinched but not sticky. Turn out onto a lightly floured work surface; knead for 1 minute. Let stand 10 minutes.
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4
Knead dough again until smooth and elastic, about 5 minutes. Place in a lightly oiled bowl; cover with plastic wrap. Leave in a warm place until doubled in size, about 45 minutes. Punch down dough and divide in half. Cut each half into sixths; form flattened balls. Arrange buns 3 inches apart on parchment-lined baking sheets. Cover; let stand until doubled in size, 45 minutes.
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5
Preheat the oven to 400u00b0F. Whisk remaining egg yolk and milk; brush egg wash lightly over buns. Top buns with the seeds, if using. Bake until golden and hollow sounding when tapped, 13 to 15 minutes. Cool on a wire rack. Buns can be frozen in resealable plastic bags up to 2 months.
