Royal Vegetarian Biryani Pakistani Style

Name: Royal Vegetarian Biryani Pakistani Style
Ingredients: For the vegetable curry sauce:; 10 tablespoons vegetable oil (not olive); 2 red onions, peeled, finely chopped; 1 teaspoon each of grated ginger and crushed garlic; 400 grams natural yogurt; 1 teaspoon red chilli powder; 1/2 teaspoon turmeric; 2 teaspoons dried fenugreek leaves or 1/2 bunch fresh fenugreek leaves; 300-400 grams mixed fresh seasonal vegetables; 250 grams Basmati rice, washed and soaked in tap water for 30 minutes, then par-boiled in hot boiling salty water for only 2-3 minutes; Whole spices and garnish:; 1 inch cinnamon quill; 10 cloves; 7 green cardamoms; 1 teaspoon cumin seeds; 1 teaspoon coriander seeds; 1/2 teaspoon black peppercorns; 1/2 bunch coriander leaves; 10 mint leaves; 1/2 lemon, sliced into 3-4 slices; 2-3 green chilli; 1 pinch saffron, infused in 1 tbsp hot boiling water for 15 minutes