INGREDIENTS
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1 1/4 c. ketchup
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1/4 c. sriracha
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1/2 c. chopped onion
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1/2 c. chopped carrots
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1/2 c. chopped celery
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3/4 c. chopped parsley
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2 garlic cloves, roughly chopped
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kosher salt
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Freshly ground black pepper
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3/4 c. panko (Japanese bread crumbs)
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1 egg, beaten
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1 lb. ground beef
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1 lb. ground pork
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4–6 pieces greenleaf lettuce
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1 large beefsteak tomato, sliced
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1 large red onion, sliced
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8 slices crusty country bread