Sticky tamarind pork ribs

Name: Sticky tamarind pork ribs
Ingredients: 2 tsp garlic granules; 2 tsp onion granules; 1 tbsp paprika; 1 tsp ground turmeric; 2 tsp ground fennel; 1 tsp caster sugar; 2 pork rib racks (about 500g each); 3 tbsp yellow American-style mustard; 3 tbsp tamarind paste; 3 tbsp light brown soft sugar; 4 tbsp soy sauce; 2 tbsp tomato ketchup; 1 tbsp sriracha; 75g salted butter; 30g coriander finely chopped; 10 mint leaves; 2 garlic cloves crushed; 2cm piece of ginger peeled and grated; 2 tbsp Greek-style yogurt; 2 tbsp olive oil; 1 lime zested and juiced; 1 green chilli (optional)