Chicken gravy, crisp brussels sprouts – Saturday Night Pasta

Ingredients

• 500 g chicken thighs, skin on and bone in (roughly 4 thighs)
• 2 tablespoons salted butter
• 2 tablespoons extra-virgin olive oil
• 1 garlic clove, skin on, lightly smashed with the side of a knife
• 1 rosemary sprig
• 85 ml dry white wine
• 125 ml (1⁄2 cup) good-quality chicken stock
• sea salt and freshly ground black pepper
• handful of brussels sprouts (or use 4 large cavolo nero or kale leaves)
• 2 teaspoons plain flour
• handful of grated Parmigiano Reggiano, plus extra to serve