Pour 1 1/2 cups of water over the dried mushrooms and bring to a boil and cook for 5 minutes.
In a pan, heat up oil and sautee the minced garlic, ginger, onion and the white parts of the scallions.
Take the mushrooms out the water, chop them and transfer to the pan. Season with salt and pepper.
Add the sriracha, rice vinegar, sugar and cook for another 30 seconds.
Add the soy sauce, tofu cubes, and mushroom broth. Simmer for 10 minutes or until the liquid reduces by half.
In a small bowl, combine the corn starch with 2-3 tbs water before adding it to your sauce. Cook for another minute or until it thickens.
Serve with rice and top with chopped scallions and sesame oil.