Tom Yum Spaghetti สปาเก็ตตี้ต้มยำกุ้ง

Name: Tom Yum Spaghetti สปาเก็ตตี้ต้มยำกุ้ง
Cuisine: Asian
Ingredients: 1 stalk lemongrass, bottom half only, thinly sliced; 6 slices galangal, chopped; 6 kaffir lime leaves, finely julienned; 1-3 Thai chilies, to taste; Half a medium onion, chopped; 2 Tbsp Thai chili paste; 1 ½ Tbsp fish sauce; 14 oz good quality whole peeled plum tomatoes (half of a 28oz/796ml can); 150g shimeji mushrooms (see note); 12-15 medium shrimp, or as many as you’d like; 250g spaghetti; 1 ½ - 2 Tbsp lime juice; Chopped cilantro, as much as you want; Grated parmesan cheese for serving (optional)