Afghan Chopan Kabab Recipe International Cuisines

This time I am making Chopan kabab an afghan recipe
Mangal: https://amzn.to/2BeTAtf
Ingredients:
2 Kilo Goat ribs
1 red capsicum
2 small green capsicum
1 1/2 red onion
4 cloves of garlic
1 green chili
1 bunch of coriander
1 Tbsp cumin
1 Tbsp salt
1 tsp chili flakes
1/2 TBSP white pepper