laksa – Spiced Indonesian Noodle Soup

Name: laksa – Spiced Indonesian Noodle Soup
Ingredients: Laksa paste: 1 knob fresh ginger, peeled; 2 garlic cloves, peeled; 1 or 2 red chillis, depending on required spiciness; 1 lemongrass stalk, trimmed and thinly sliced; 2 tbsp tamarind sauce; 1 tbsp fresh coriander, chopped; 1 tbsp oil; 200g medium egg noodles, flat or udon; 125g plain tofu, cut in chunks; 500ml vegetable stock; 1 can coconut milk, shaken; 250g button mushrooms, halved; 250g fresh tomatoes, peeled; To garnish: 2 spring onions, thinly sliced for ga; chopped coriander and a wedge of lime; 1 tbsp soy sauce to season