Make your own Nando's with Phil Vickery's Peri Peri chicken

Name: Make your own Nando's with Phil Vickery's Peri Peri chicken
Cuisine: Moroccan, Greek, European, Mediterranean, American, African, Southern
Ingredients: 8 spring onions, roughly chopped; 4 cloves garlic, peeled and roughly chopped; 2 tsp ground coriander; 2 tbsp malt or any vinegar; 2 level tbsp dark brown sugar; 1 tbsp smoked paprika; 6-8 tbsp Sriracha or any mild chilli sauce; Juice 1 large lemon; 6-8 tbsp olive oil; Salt; Pepper; 1 medium chicken, cut into 4 quarters; 3 tbsp olive oil; 1 small onion, very finely chopped; 1/2 yellow & red pepper, diced; ½ tsp smoked paprika; 1 tsp turmeric; 200g long grain rice; 400ml roughly boiling water (or double the volume of water to rice); 2 chicken stock cubes, crushed; Pepper, lots; 2 tbsp cold cubed salted butter; 500g frozen petit pois peas, cooked and warm; 50g butter; 1 tbsp Sriracha sauce; 2 tbsp fresh mint, chopped; 2 tbsp fresh parsley, chopped; 2 heaped tbsp of the leftover marinade; 6 heaped tbsp mayonnaise; 1 tbsp tomato ketchup