"Dig into these fully loaded burgers with caramelized onions and blue cheese served on portobello mushroom caps...."
INGREDIENTS
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¼ cup avocado oil, divided
1 tbsp organic unsalted butter
1 large sweet onion (such as Vidalia), thinly sliced
1⅛ tsp sea salt, divided
4 portobello mushroom caps, gills scraped out
1 lb ground beef
½ tsp ground black pepper
4 leaves green leaf lettuce
1
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