Fish Tom Kha Gai with Udon Noodles and Peanuts

Name: Fish Tom Kha Gai with Udon Noodles and Peanuts
Ingredients: 1 shallot, finely diced; ½ pack Swiss brown mushrooms, thinly sliced; 1½ tablespoons red curry paste; 1 can coconut milk (shake well before opening); ½ cup water; 1 kaffir lime leaf, central stem removed and finely sliced; 2 teaspoons fish sauce; 1 teaspoon brown sugar; 1–1½ teaspoons soy sauce; 2 bundles dried udon noodles; 2 baby bok choy, thinly sliced; 300g fish fillets; Juice of 1 lemon; 1–2 spring onions; ¼ cup picked coriander leaves; 80–100g whole roasted peanuts