To get a chargrill/barbecue flavour from stove top cooking, try caramelizing the ingredients by putting 1/2 teaspoon sugar in oil as the first step and let the sugar turn to dark brown liquid. Or, add some Thai/Indian sweet and sour sauce when ingredients are getting cooked. Put the heat on high for the sauce to burn and give a barbecue/burnt flavour. This will save fuel energy used by the barbecue and some of your precious time.