In a small bowl, stir together cashew butter, chili garlic sauce, soy sauce, and water to make a smooth paste. If you wish, toast cashews lightly in a small frying pan or oven for a few minutes.
In a preheated wok or frying pan, cook onion in oil over high heat for 3 mins or until beginning to brown. Add carrot and cook for 1 min., add broccoli and cook for another 30 seconds, then add red pepper, bok choy and snow peas, cooking just long enough to heat through. Add sauce, stir to combine.