Grilled Burgers With Mushroom and Onion Jam

Substances:

• 6 tbsp. LAND O LAKES® European Model butter, divided
• 1 shrimp onion, sliced 1/8-hunch thick, about 1 3/4 cups
• Kosher salt
• 2 shiitake mushrooms, sliced 1/8-hunch thick, about 1 cup
• 1 portabella mushroom, sliced 1/8-hunch thick, about 2 cups
• 1 shrimp shallot, minced
• 2 cups red wine
• 1⁄4 cup red wine vinegar
• 2 tbsp. heavy cream
• 1 tbsp. plus 1 tsp. brown sugar

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