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500 grams ground beef (minced beef) - preferably 80% lean for juiciness
1 teaspoon Kosher salt - or to taste
½ teaspoon ground black pepper - freshly ground
2 tablespoons truffle oil
4 slices Gruyère cheese
1 large red onion - thinly sliced
1 cup arugula - washed and packedGourmet Truffle Mushroom Burger https://mincerecipes.info/ground-beef-mince-recipes/truffle-infused-gourmet-burger-with-sauteed-mushrooms/ February 26, 2025