Levi Roots-stylee jerk chicken

Name: Levi Roots-stylee jerk chicken
Cook time: 1 h
Total time: 1 h
Cuisine: American, Latin American, Caribbean
Ingredients: 1 tablespoon allspice berries; 1 tablespoon black peppercorns; 1 tablespoon dried chilli flakes; ½ tablespoon muscovado sugar; 2 tablespoons runny honey; a few sprigs fresh flat-leaf parsley; a few fresh coriander sprigs; 2 scotch bonnet chillies; 1 garlic clove; a 3cm piece of fresh ginger, peeled; 2 spring onions, trimmed and finely sliced; olive oil; 4 higher-welfare chicken thighs and 4 drumsticks, skin on; optional: beer, for drizzling; 1 lime; 250g self-raising flour, plus extra for dusting; 250g yoghurt; ½ teaspoon baking powder; 1 jalapeño chilli, finely sliced