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["Make dough: Place 1/4 c. hot water in large, hot bowl.", "Sprinkle in yeast; stir till dissolved.", "Add in remaining water, onion, sugar, butter, salt and 1 1/2 c. flour; blend well.", "Stir in sufficient remaining flour to make soft dough.", "Knead on lightly floured surface till smooth and elastic, about 4 to 6 min.", "Place in greased bowl, turning to grease top.", "Cover; let rise in hot, draft-free place till doubled in size, about 45 to 60 min.", "Make filling: In large bowl, combine roast beef, barbecue sauce, catsup, liquid smoke and mustard; reserve.", "Punch dough down.", "Remove dough to lightly floured surface; divide into eight equal pcs.", "Roll each piece to 5-inch circle.", "Place about 1/2 c. filling in center of each circle.", "Pull up dough to enclose filling and healthy pinch at top to seal.", "Place buns, pinched sides up, on two greased baking sheets.", "Cover; let rise in hot, draft-free place till almost doubled in size, about 30 to 45 min.", "Bake at 375 F for 20 min or possibly till done; switch positions of sheets halfway through baking time for even browning.", "Remove from sheets to wire racks.", "Serve hot.", "Chill leftovers; reheat to serve.", "Yield: 8 BunsT(Baking Time):""0:20"""]