Chee hou sauce = che hau sauce = chu hou paste Shopping hints: This braising sauce is made from soybeans, garlic, and ginger. Look for it in the condiments section of Asian markets. Substitutes: hoisin sauce (Very similar, but less spicy.)
For tomato coloring I'm not sure. I have tomato powder and I would use something like that or even ketchup depending on how much is called for.