Lemon Chicken Biryani

Name: Lemon Chicken Biryani
Ingredients: 1 and 3/4 cups 350g basmati rice; 27 ounces just under 3 1/2 cups, 800ml chicken stock, divided; 2 Tbsp olive oil or ghee clarified butter; 8 chicken thighs or a combination of legs and thighs; Salt and freshly ground black pepper; 1 large onion thinly sliced; 1 large shallot thinly sliced; 2 tsp coriander seeds; 1 tsp cumin seeds; 1 tsp fennel seeds; 10 black peppercorns; 2 black cardamom pods seeds removed, husks discarded; 15 green cardamom pods seeds removed, husks discarded; 1 thumb-sized knob fresh ginger peeled and thinly sliced; 4 garlic cloves peeled; 1/2 cup whole cashews raw preferred; approximately 1/4 cup 50g ground almonds; 8 Tbsp Greek yogurt whole milk; 1 tsp turmeric; 1/3 cup currants; zest and juice of 1 lemon; garnish; 1/3 cup slivered almonds; fresh coriander leaves; pomegranate seeds; lemon wedges