Curtis Stone's piri piri chicken with slaw

Ingredients

• 6 large red Fresno chilies , (about 5 ounces), coarsely chopped
• 4 red Thai chilies , stemmed
• 1/4 cup red wine vinegar
• 5 garlic cloves
• 2 1/2 tsp kosher salt
• 2/3 cup olive oil
• 1 pound boneless, skinless chicken thighs , cut into 2 to 3 pieces each
• Bamboo skewers , soaked in water for at least 1 hour, or metal skewers
• grilled flatbreads or 4 purchased naan

Slaw

• 1/4 small head green cabbage , very thinly sliced (about 2 1/2 cups)
• 1/4 English (hothouse) cucumber , halved lengthwise and thinly sliced
• 1/4 white onion , very thinly sliced
• 1/4 cup loosely packed mint leaves , thinly sliced
• 1 tbsp finely grated lime zest
• 2 tbsp lime juice
• 2 tbsp extra-virgin olive oil
• Kosher salt