You only receive 4 tortillas from the final Goal To the last Grind part. Personally I'll opt out of that since it's much easier to just make the tortillas. I am working on level three of the Americana tacos. And will immediately go to the level 3 of Treehuggers. I freely admit I love Mastery spices! It's a must to complete these quests for me. I haven't used any gems but I could because I get them from my gem recipes
I do think I've used about 6 or 7 quick serves this entire event. I haven't spent a ton of time on this. I keep a stock of mastery spices. Just check in every hour and half to collect and throw on new food, it only takes a couple minutes. There are still 4 days to complete! That's a lot of time.
Good luck!
Btw! Omg Ellyse99 that msg comment made laugh out loud for real!