Cut the Vietnamese sausage (Cha Lua plain, and Cha Hue for peppered) in half lengthwise, then thinly slice each half. A mix of regular and pepper varieties would work well.
Slice the hot dogs thinly at an angle. (Just a note, the shorter hot dogs tend to have the casings removed.)
Slice the imitation crab into 1/2 inch pieces and the squid into 1/4 inch pieces.
Cut the onion in half from top to bottom, then thinly slice each half.
Finely slice then chop the carrot. Safe bet would be to cut the carrot into 2 inch pieces, julienne, then cut the stack in half.
For the mushrooms, if using white ear variety, blanch that for a few minutes, drain and let cool down. Your choice of fresh mushrooms, buttons sliced, Shimeji chopped, Shiitake sliced with the stem removed would also be nice.
For the tomatoes, cut in half and remove the seedy pulp then slice.
Seed and finely chop one Bird's Eye chili.
Place the prepared meats and veggies in a large mixing bowl and toss to combine. Splash with some soy sauce and a couple of tablespoons of lime juice. Toss together until all is coated well. (Keep in mind, my photo shows a very large pot, this is at a wedding so a lot of chow was made, but this was delicious! I will make this on a much smaller scale than what this photo shows.)
Serve as a side dish with any Thai dish.