Vegan Sweet and Sour Pork 咕噜肉 (Monkey Head Mushroom 猴头菇)

Name: Vegan Sweet and Sour Pork 咕噜肉 (Monkey Head Mushroom 猴头菇)
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: Chinese
Ingredients: 40 g dried monkey head mushroom/lion's mane mushroom (猴头菇); ½ tbsp soy sauce; 120 g cornstarch; ½ red onion (chopped into quarters); ½ green bell pepper (chopped); 1 small tomato (chopped); 1 stick of pineapple (chopped); ⅓ cup ketchup; ⅓ cup water; ½ tbsp vinegar; ½ tbsp sugar; 1 tsp cornstarch