"Think beyond the bun...."
INGREDIENTS
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4 tbsp. extra-virgin olive oil, divided
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1 1/2 lb. lean ground beef
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Kosher salt
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Freshly ground black pepper
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1 medium yellow onion, finely chopped
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12 oz. orzo (about 2 cups)
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3 garlic cloves, finely chopped
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2 c. low-sodium beef broth
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1 (15-oz.) can tomato sauce
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3 tbsp. tomato paste
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2 tbsp. packed light brown sugar
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1 tbsp. apple cider vinegar
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1 tbsp. Worcestershire sauce
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3 c. packed baby spinach (about 3 oz.)