For best results, slice meat thinly against the grain. Ensure oil is at a high-smoke-point (like vegetable or peanut oil) for deep-frying. If stir-frying, you can blanch the meat in boiling water for 1 minute instead of oil-blanching, then drain before adding to your stir-fry.
Keyword meat tenderizing, velveting technique, Chinese cooking, cornstarch, egg white, stir-fry, deep fry