PAD THAI SAUCE:
Place tamarind, fish sauce, rice vinegar, molasses, brown sugar, lime juice, soy sauce and crushed red pepper in a small saucepan and bring to a simmer. Keep warm until time to assemble dish.
PAD THAI:
Toss warm, cooked noodles with 2 tablespoons of peanut oil to prevent sticking.
In a large sauté pan over medium-high, heat 2 tablespoons of peanut oil. Add sliced shallots and sauté until soft. Add bean sprouts and snow peas; sauté until vegetables begin to soften and brown around the edges. Add cabbage and sauté until wilted.
In a large serving bowl, mix noodles and vegetables. Pour in Pad Thai Sauce; stir to coat.
Top each serving with a few slices of grilled tofu, salmon or tuna. Garnish with thinly sliced scallions, crushed peanuts, and a lime wedge.