Grilled Flank Steak with Chili

Ingredients

• 1/4 cup (2 fl oz or 60 ml) apple cider vinegar
• 2 tablespoons (1 fl oz or 30 ml) olive oil
• 1 tablespoon (10 g) red hot chili pepper
• 1 teaspoon (3 g) garlic, minced
• 1 teaspoon (2 g) onion powder
• 1/2 teaspoon (1 g) ground cumin
• 1 lb. (450 g) flank steak
• salt and freshly ground black pepper