Soak 10 red chillies in hot water for 30 mins and grind it to a paste with little water. I ground more as the chillies wont get ground smoothly if we grind less. Save the excess for later use in other cooking.
In a wok/ kadai, oil and add remaining 2 red chillies (add sichuan pepper along if adding) and finely chopped garlic. Do not change the color of the garlic. Just fry till fragrant, say half to one minute. Add finely chopped onion and fry for another minute in high flame.
Add soya sauce, sugar, vinegar ground red chilli paste. Fry till oil oozes out.
Add the finely chopped vegetables, salt and toss well in high flame. The veggies should get cooked, retain its crunchiness as well(2 mins). Add more oil if needed.
Add cooked rice, toss gently to mix well. The rice should get heated and you start hearing cracking sound. For this you have to toss in high flame. If not possible, just give it a stir in high flame. That's enough.