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1
Place turkey pieces on large plate in single layer.
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2
Freeze meat until very firm and hardened around edges, 35 to 45 minutes.
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3
Meanwhile, sprinkle gelatin over chicken broth in small bowl and let sit until gelatin softens, about 5 minutes.
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4
Pulse mushrooms in food processor until coarsely chopped, about 7 pulses, stopping and redistributing mushrooms around bowl as needed to ensure even grinding.
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5
Set mushrooms aside; do not wash food processor.
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6
Pulse one-third of turkey in food processor until coarsely chopped into 1/8-inch pieces, 18 to 22 pulses, stopping and redistributing turkey around bowl as needed to ensure even grinding.
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7
Transfer meat to large bowl and repeat two more times with remaining turkey.
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8
Return 1/2 cup (about 3 ounces) ground turkey to bowl of food processor along with softened gelatin, soy sauce, and baking soda.
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9
Process until smooth, about 2 minutes, scraping down bowl as needed.
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10
With processor running, slowly drizzle in oil, about 10 seconds; leave paste in food processor.
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11
Return mushrooms to food processor with paste and pulse to combine, 3 to 5 pulses, stopping and redistributing mixture as needed to ensure even mixing.
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12
Transfer mushroom mixture to bowl with ground turkey and use hands to evenly combine.
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13
With lightly greased hands, divide meat mixture into 6 balls.
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14
Flatten into 3/4-inch-thick patties about 4 inches in diameter; press shallow indentation into center of each burger to ensure even cooking.
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15
(Shaped patties can be frozen for up to 1 month.
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16
Frozen patties can be cooked straight from freezer.
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17
).
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18
FOR A CHARCOAL GRILL: Open bottom vent completely.
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19
Light large chimney starter filled with charcoal briquettes (6 quarts).
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20
When top coals are partially covered with ash, pour evenly over half of grill.
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21
Set cooking grate in place, cover, and open lid vent completely.
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22
Heat grill until hot, about 5 minutes.
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23
FOR A GAS GRILL: Turn all burners to high, cover, and heat grill until hot, about 15 minutes.
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24
Leave primary burner on high and turn off other burner(s).
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25
Clean and oil cooking grate.
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26
Brush 1 side of patties with oil and season with salt and pepper.
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27
Using spatula, flip patties, brush with oil, and season second side.
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28
Place burgers over hot part of grill and cook until burgers are well browned on both sides and register 160 degrees, 4 to 7 minutes per side.
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29
(If cooking frozen burgers: After burgers are browned on both sides, transfer to cool side of grill, cover, and continue to cook until burgers register 160 degrees.
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30
).
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31
Transfer burgers to plate and let rest for 5 minutes.
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32
While burgers rest, grill buns over hot side of grill.
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33
Transfer burgers to buns, add desired toppings, and serve.
