In a blender combine the peanut butter, soy sauce, lemon juice, garlic, red pepper flakes, sugar and hot water until smooth.

 

In a pot of boiling salted water, boil the pasta until just tender; transfer to colander and rinse briefly under cold water. Drain the pasta noodles well.

 

In a large bowl, toss noodles with peanut sauce, cucumbers, scallions and red peppers. Add salt and pepper to taste.

 

Serve immediately at room temperature.