Pot roasted guinea fowl with roasted baby turnips

Name: Pot roasted guinea fowl with roasted baby turnips
Ingredients: 1 whole guinea fowl; 25g/1oz unsalted butter; 1 small bunch fresh sage leaves; 1 onion, sliced; 100g/3½oz piece pancetta; 4 garlic cloves; 300ml/½ pint chicken stock; 1 bay leaf; 1 unwaxed lemon, zest only; salt and freshly ground black pepper; 15g/½oz bonito flakes; 100ml/3½oz soy sauce; 1 tsp caster sugar; 50ml/2fl oz mirin; 1 tbsp togarashi (Japanese spice mixture); 1 unwaxed lemon, zest and juice; 8 baby turnips with greens; 2 tbsp olive oil; pinch salt; 1 tbsp sesame seeds, toasted