In a bowl, mix up the ketchup, red chili sauce(or sriracha), green chilli sauce(or green sriracha), dark soy sauce, tomato ketchup,and salt +pepper. Set aside.
In another bowl, mix cornstarch & water thoroughly to make a slurry. Set nearby.
Place a wok or a wide pan (I use 10 inch ) on stove and let heat up on high. Most part of the cooking will be done on high heat.
Pour oil into the wok and let it get slightly smoky. Add chopped garlic, ginger, cilantro stems, green chilies, onion, green onion/ scallion white parts all at once. Cook for 1 -2 minute or till you smell a nice aroma and the veggies start looking lightly charred.
Add in the sauce mixture that we made earlier. Combine with aromatics and fry for 1-2 minutes or untill you start seeing bubbles. This indicates that the sugars are caramelizing, which means great flavors are developing.
Next, pour about ¼ cup of hot water (or stock) to the wok. When the water starts slowly boiling, while stirring the contents of wok with one hand, pour in the cornstarch slurry that we made.
After adding corn starch, reduce the heat to medium and let simmer for about 1-3 minutes untill the sauce thickens. Don't thicken too much because as the manchurian gravy cools down while we deep fry the caulifower,it is naturally going to thicken more.
Switch off the stove, do a taste test & adjust the salt quantity if needed. Mix in the honey and vinegar and leave to cool down. Proceed to frying the gobi.