Vietnamese pork stir-fry

Ingredients

• 2 tablespoons fish sauce
• 1 tablespoon soy sauce
• 2 tablespoons sugar
• 2 stalks lemongrass, white section only, finely chopped
• 2 cloves garlic, chopped finely
• 450 grams pork fillet, sliced finely
• 2 tablespoons vegetable oil
• 1 red onion, peeled, sliced finely
• 2 large red chillies, seeded, chopped finely
• 1 red capsicum, julienned
• 1 yellow capsicum, julienned
• 1 tablespoon lime juice
• 2 tablespoons roughly chopped peanuts
• 1/2 cup fresh mint leaves
• steamed rice, to serve