Cook pasta noodles in a large pot of boiling salted water until just al dente (about 6 min).
Drain and rinse with cold water to keep them from cooking any longer.
Heat a large pan on high until very hot and add 1 tablespoon of ghee to it and tilt the pan around to coat.
After about 20 seconds, when the oil is hot, add the shrimp and spread out evenly to sear.
After about a minute (or when the shrimp is slightly seared) flip to sear the opposite side of the shrimp. Cook for another minute and set shrimp aside in a plate.
Turn pan to medium heat and add in garlic, ginger, snow peas, mushrooms, bamboo shoots, and serrano chili and sauté for a couple minutes by mixing around with a spatula.
After 2 minutes, add back in the shrimp and mix.
Turn to med-low and add in noodles and 1 tablespoon ghee. Mix around just to heat up noodles for a minute or two, then turn off the heat and mix in soy sauce and lime juice.
Top with sliced green onion, and serve.