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1
Turn all burners to high, close lid, and heat until very hot, about 15 minutes.
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2
Use grill brush to scrape cooking grate clean.
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3
Lightly dip wad of paper towels in vegetable oil; holding wad with tongs, wipe cooking grate.
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4
Leave primary burner on high, turn other burner(s) to low.
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5
Meanwhile, mash bread and milk in large bowl with fork until homogeneous (you should have about 1/4 cup).
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6
Stir in salt, pepper, garlic, and steak sauce.
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7
Break up beef into small pieces over bread mixture.
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8
Using fork or hands, lightly mix together until mixture forms cohesive mass.
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9
Divide meat into 8 equal portions.
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10
Gently toss one portion of meat back and forth between hands to form loose ball.
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11
Gently flatten into 1/2-inch-thick patty that measures about 4 1/2 inches in diameter.
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12
Press center of patty down with fingertips until it is about 1/3 inch thick, creating a slight depression in each patty.
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13
Repeat with remaining portions of meat.
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14
Lightly dip wad of paper towels in vegetable oil; holding wad with tongs, wipe cooking grate.
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15
Grill burgers on hot side of grill, covered, until well seared on first side, 2 to 4 minutes.
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16
Using wide metal spatula, flip burgers and continue grilling, about 3 minutes for medium-well or 4 minutes for well-done.
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17
Serve burgers on toasted buns.
