1 1/2 lbs ground chuck |
2 tablespoons finely chopped fresh cilantro |
2 tablespoons finely chopped fresh mint |
1 tablespoon fresh lime juice |
2 teaspoons fish sauce |
2 teaspoons minced jalapeno peppers, with seeds |
2 teaspoons minced garlic |
1 teaspoon grated lime zest |
1 teaspoon grated fresh ginger |
1/2 teaspoon fresh ground black pepper |
3 tablespoons unsalted butter |
2 tablespoons peanut oil |
2 teaspoons grated fresh ginger |
8 ounces fresh shiitake mushrooms, stems removed, caps cut into 1/4-inch slices |
1/4 teaspoon kosher salt |
1/4 teaspoon fresh ground black pepper |
peanut oil |
4 hamburger buns |