Toss the pork with the soy sauce and sherry in a medium bowl.
Combine the garlic, ginger, scallions and 1 ½ teaspoons oil in a small bowl
Heat 2 teaspoons oil in a non-stick wok over high heat until smoking
Add the pork and cook, stirring occasionally, until no longer pink, about 2 minutes
Transfer the pork to a clean bowl
Add 1½ teaspoons of oil to the wok and heat until shimmering
Add the bell pepper and cook, stirring occasionally, until crisp-tender, about 1 minute
Add 1 ½ teaspoons oil and half the cabbage and stir –fry until crisp-tender, about 1 minute
Transfer the peppers and cabbage to a bowl
Heat the remaining oil in the wok
Add the remaining cabbage and stir-fry until crisp-tender, about 1 minute
Return the first batch of cabbage and the bell peppers to the pan and toss to combine
Clear the center of the pan and add the garlic mixture
Cook, mashing the garlic mixture with the back of a wooden spoon, until fragrant, about 45 seconds
Stir the garlic mixture into the vegetables
Add the pork and toss to combine
Whisk the sauce to recombine and add to the skillet
Note: You may have more sauce than you will actually need – I add just enough sauce to completely coat the pork and vegetables well – this is a personal preference as I like my stir fry to be well sauced so that the rice can absorb some of the sauce when serving.
Remove the pan from the heat and toss until all ingredients are well coated with sauce and heated through
Serve immediately over steamed rice
For Hot and Sour Sauce:
Combine all the ingredients in a small bowl and set aside