For the treats:
1 pound sliced bacon, cut into 1-inch wide pieces
13 ounces chicken livers, in into ½-inch pieces
¾ cup + 1 tbs fine cornmeal
3 cups + 3 tbs all-purpose flour
1 cup chicken stock, unsalted
For the glaze
3 tablespoons ketchup
1 egg white
Position the racks in the upper and lower thirds of the oven and preheat oven to 250 degrees. Line two sheet pans with silpats or parchment paper.
Heat a large nonstick frying pan over medium-high heat. Add the bacon and cook for 4-5 minutes, until it has rendered its fat and is a rich golden brown. Remove from the pan and drain on paper towels.
Pour off all but a generous film of bacon fat. Add the chicken livers to the pan and sauté, turning them frequently and smashing them slightly for about 5 minutes, until broken down to a paste. Remove from the heat.
Place the bacon in a food processor and pulse a few times to grind it. Add the chicken livers and process to combine, then add the cornmeal and process until you have a coarse mixture.
Transfer the mixture to a bowl of a stand mixer fitted with the paddle attachment. Add the flour and mix to combine. Slowly pour in the chicken stock and mix until the dough begins to gather around the paddle and feels moist to the touch. Remove the dough from the mixer and knead it just enough to combine.
Place the dough between two pieces of parchment paper or plastic wrap and roll it out to a 3/8-inch thick sheet. Using the dog bone cutter, cut out the treats and arrange them on the prepared sheet pans. Knead the trimmings together, roll out, and cut out the additional treats.
Bake until the treats are completely dry, about 1 ½ hours in a convection oven (3 hours in a standard oven). Remove from the oven and lower the temperature to 200 degrees.
For the glaze: combine the ketchup and egg whites; the glaze will be very thick. Brush it over the top of the warm treats. Return the pans to the oven and bake for 20-30 minutes, or until the glaze has set. Place the pans on a cooling rack and cool for 5-10 minutes, then transfer the treats to the rack to cool completely.
The treats can be stored in a covered container for up to 1 month.
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