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1
Sprinkle the yeast into the water and stir in honey, sugar and butter. Set aside for about 5 minutes, or until frothy.
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2
Pour yeast mixture into the bowl of an electric mixer. Add egg and combine slowly. Incorporate flour one cup at a time until dough is sticky, yet pulls away from the edge of the bowl.
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3
Turn the dough out onto a lightly floured working surface and knead for about 3-5 minutes minutes until you've made a soft, smooth round of dough. Place the dough in a bowl doused with vegetable oil, cover it with a towel and let rise approximately 30-40 minutes or until doubled in size.
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4
Dump dough back onto a lightly floured surface and knead 1-2 minutes. Divide the dough into 4 pieces and shape each piece into a ball. Place the balls of dough on lightly oiled baking sheets about 3 inches apart and flatten slightly with the palm of your hand.
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5
Whisk egg yolk and milk and glaze the buns with the mixture, then sprinkle with rosemary and onion. Bake in a preheated oven at 375 degrees for 12 - 15 minutes, until golden brown. Remove them from the oven and cool on a wire rack.
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6
While buns cool, use your hands to mix all of the ingredients for the veal burgers until just incorporated.
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7
Divide into 4 balls and press into slightly flattened patties. Cook on the stove or grill at medium high heat to desired doneness, approximately 3-4 minutes per side for medium.