Heat oil till very hot. Add ginger and stir-fry over high heat till lightly golden. Add fermented black beans, garlic, chillies and spring onions (white part). Stir-fry till fragrant. Add minced pork and stir-fry till wok is hot again, jabbing to break up meat into small pieces. Drizzle with wine and stir through. Drizzle with ketchup mixture. Stir till absorbed. Drizzle with 2 tbsp water. Stir through. Add sugar and another 2 tbsp water. Stir a few minutes till sauce is reduced.
1½ tbsp corn oil, 1 tbsp minced ginger, 1 tbsp minced garlic, bird's eye chillies to taste (roughly chopped), 1 tsp thinly sliced spring onions (white part), 300 g fatty pork mince, 1 tbsp Shaoxing wine, 1 tsp sugar