Chicken Vindaloo



1 tbsp whole peppercorns
1 tbsp yellow mustard seeds
2 tsp cumin seeds
2 tsp coriander seeds
5 whole cloves
1 (1”) cinnamon stick
4 tbsp kashmiri chili powder
¼ cup, plus 2 tbsp red wine vinegar
1 tsp turmeric
2 tsp brown sugar
16 cloves of garlic
1 (3”) piece of ginger- cut into 2 pieces
2 lbs boneless chicken (breast or thighs), chopped into bite sized pieces
3 tbsp olive oil
2 large spanish onions, finely chopped
2 serrano chiles, stemmed, seeded, and minced (plus more for garnish)
½ lb small yukon gold potatoes, cut into quarters
Salt, to taste