Sweet potato curry with paneer

Ingredients

• 1 onion (chopped)
• 2 garlic cloves (crushed)
• 500 g orange sweet potatoes (peeled and cut into chunks)
• 1 tbsp mild curry powder
• 1 tbsp fresh ginger (finely chopped)
• 1 398 ml can chopped tomatoes
• 1⁄3 cup diluted salt-reduced or homemade vegetable stock (plus 2 tablespoons)
• 1 cup shelled fresh or frozen peas (thawed if necessary)
• 250 g paneer or firm tofu (cut into 1.5 cm cubes)
• 2 tbsp fresh mint (chopped or whole)