Heat a wok with first part of oil over medium-high heat. Add tofu and saute until tofu is lightly browned on all sides, 5 to 6 minutes. Season with some salt and pepper and cook for 1 minute more. Set tofu aside and return pan to heat.
Add second part of oil to wok and then mushrooms, snow peas, and carrots. Saute until starting to turn tender, 3 to 4 minutes.
Add tofu back to wok along with sauce and bring to a simmer. Simmer until sauce bubbles and thickens, ~2 minutes.
Remove from heat and add noodles. Toss everything to combine.
Top lo mein with lemon juice and cilantro. Serve with some hot sauce if you’d like. Enjoy!