Start by heating your cooking oil for deep or shallow frying to around 180 °C (356 °F). While you wait for it to heat up cut 100 g green bell pepper(s), 100 g yellow onion(s) and 75 g carrot(s) into rough bitesize pieces and set aside for later.
Cut 200 g slab skinless pork belly into rough cubes and place in a bowl along with 1 pinch salt, 1 pinch ground black pepper and 1 tbsp all-purpose flour. Mix until all of the pork pieces are evenly coated.
Next, add 1 egg yolk to the bowl and mix thoroughly until evenly coated once more.
Once the oil is fully heated, sprinkle 2 tbsp cornstarch onto a plate. Roll each piece of pork in the cornstarch and place it straight into the oil.
Fry the pork until crispy and cooked through. This should take about 3-4 mins depending on the size of the pieces.
Once the pork is cooked and crispy, transfer to a wire rack or kitchen paper to drain the excess oil.
Add the carrots to the oil and set a timer for 1 minute, then add the onion and bell pepper and deep-fry for 1 more minute.
Transfer the vegetables to a wire rack to drain.
Take a new pan and while it's still cold, add 2 tbsp tomato ketchup, 2 tbsp rice vinegar, ½ tbsp sake, 2 tbsp white sugar, 3 tbsp water, 1 tsp soy sauce, ½ tsp Chinese-style chicken bouillon powder and ½ tsp cornstarch. Mix it well before turning on the heat.
Heat on medium and continue to mix the sauce. After a few minutes it should start to become thick and glossy. Add the vegetables and fry them together for a minute or so, allowing the sauce to thicken a little more.
Finally, add the pork and mix thoroughly, ensuring everything is coated in sweet and sour sauce.
Turn off the heat and dish up. Sprinkle with ½ tsp white sesame seeds.
Enjoy!