Cook the noodles in boiling water until just al dente, about 3-4 minutes. Drain and set aside.
Heat the oil in a large skillet over medium heat until shimmering and hot, about 1 minute.
Add the minced garlic to the skillet and sizzle for 1-2 minutes, stirring constantly, until fragrant and golden but not burnt.
Stir in the soy sauce, sesame oil, and plant-based butter, mixing well until the butter melts and the mixture is fragrant, about 30 seconds.
Add the drained noodles to the skillet and toss with tongs to coat evenly in the garlic oil mixture. Cook for 1-2 minutes, allowing flavors to meld and noodles to heat through.
Squeeze the lemon juice over the noodles and toss again to brighten the flavors.
Remove from heat and sprinkle with chopped scallions for a fresh, crunchy contrast.
Give everything a final toss, then transfer to serving plates immediately for the best texture and flavor.