all methods of cooking define quality

code/modules/food_and_drinks/kitchen_machinery/grill.dm

@@ -10,6 +10,7 @@
 	var/obj/item/reagent_containers/food/grilled_item
 	var/grill_time = 0
 	var/datum/looping_sound/grill/grill_loop
+	var/quality_increase = 10 //cooking food via a grill gives it slightly higher quality
 
 /obj/machinery/grill/Initialize()
 	. = ..()

code/modules/hydroponics/grown/towercap.dm

@@ -153,6 +153,7 @@
 	var/burn_icon = "bonfire_on_fire" //for a softer more burning embers icon, use "bonfire_warm"
 	var/grill = FALSE
 	var/fire_stack_strength = 5
+	var/quality_increase = 0 //bonfires are not the greatest cooking appliance
 
 /obj/structure/bonfire/dense
 	density = TRUE