In a small sauce bowl, whisk together all ingredients. Set aside about 1oz of the mixture and save for later. The curing juice/sauce should taste a little bit sour than the normal fish sauce mixture.
When the beef cool down to room temperature, submerge them and white onion completely in curing juice, and cure for 30 minutes or until all the meat turn light brown
In a mean time, heat 2 tbsp of vegetable oil in a medium pan and quickly cook bell pepper
When beef is done with the curing process, take them out of the juice and put in a separate bowl. Served the beef with mini tacos, complimented with stir fried bell peppers, pickled, garnish and sauce on the side (add more if you want). Enjoy!