Ingredients

• 1/2 white onion chopped
• 2 cloves garlic chopped
• 1 piece (1 inch/25 cm) fresh ginger peeled and chopped
• 3 tablespoons tomato paste
• 1 tablespoon red wine vinegar
• 2 teaspoons chili paste (such as sambal oelek)
• 1 teaspoon packed brown sugar
• 1/2 teaspoon salt
• 1 lb beef top sirloin grilling steak
• 1 sweet red pepper cut in 24 pieces
• 1 sweet green pepper cut in 24 pieces