In a small bowl, whisk together lime juice, garlic, sugar, sambal oelek, vegan mushroom oyster sauce or soy sauce and 2 teaspoons of oil, just until sugar dissolves. Set aside.
In a large pot of boiling water, cook noodles according to package directions. Give rice noodles a stir to prevent clumping, and take care not to overcook. You want them al dente, not mushy. Drain noodles and set aside.
In a wok or large skillet, heat remaining 2 teaspoons of oil over medium-high heat. Add tofu cubes and cook about 3 to 5 minutes, until the tofu turns golden and slightly crusty. Very nice. Add the shredded cabbage, carrots and red pepper and turn off the heat. Give everything a toss so the vegetables think about softening.
Add the drained noodles and pour nuac cham over all. Combine gently with a large spoon.
Recipe may be covered and refrigerated for several hours at this point. Just before serving, season generously with sea salt, scatter the mint, cilantro, basil, and cilantro, and dance this mess around.
Garnish with chopped cashews, cilantro, scallions and sesame seeds, if desired.