INGREDIENTS
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2 tablespoons unsalted butter
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1 small onion, finely chopped
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1 carrot, finely chopped
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1 celery stalk, finely chopped
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3 cloves garlic, minced
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Kosher salt and freshly ground pepper
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1 cup fresh breadcrumbs
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1/2 cup whole milk
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1 large egg
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1 pound meatloaf mix (ground pork, veal, and beef)
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1/4 cup chili sauce, plus more for serving
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4 slices bacon, halved crosswise
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4 poppy seed rolls, split
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Lettuce leaves, for serving