When you're still on it, finish your old Zskera Vault Рецептокрыса negotiations for Обрывок рецептаs or delete the Rat item. This seems to be the only old Recipe Rat interaction that may block progressing on the new one. I tried with characters who didn't acquire the Крысий рецепт: жестоко фаршированные яйца or never met the Zskera Vault Recipe Rat and nothing was hidden.
If you haven't yet, learn Кулинария Драконьих островов (later, skill 50 will be mandatory to learn the recipe for the soulbound Чеддер милосердия)
Purchase 20x Кусок старого чеддера (or more, you'll need more for cooking later)
Head to Пещера Заралек's Obsidian Rest on the Драконьи острова and interact with Скрипящий сыр in a supply crate at /way #2133 52.43 26.82 Squeaking Swiss
(make sure Step 1 & 2 are done, otherwise the cheese won't be visible)
To help people who went there unprepared, on your very first interaction with Скрипящий сыр you will receive 1x Кусок старого чеддера (flags hidden quest complete) on top of the Крыса с рецептом that hops into your bags.
As long as you have the Крыса с рецептом in your bags, it will consume 1x Кусок старого чеддера every ~3min and scurry away when there's no cheddar left.(unless you've acquired all recipe scraps, Squeaking Swiss will be visible again when you lost the Rat)
Every 5min you can now Падение ниц before the Recipe Rat (by using the Крыса с рецептом) to get a random number of Клочок рецепта.
When you did acquire 30x Клочок рецепта this way, the rat will eventually escape forever, but you can now Сложить обрывки рецепта to get the Крысий рецепт: чеддер милосердия.
Learn the recipe, and get all the ingredients needed (which is quite a "ride") to cook 50x Чеддер милосердия.(depending on your cooking skills this will take up to: 50x Кусок старого чеддера , 20x Очень острый чеддер , 10x Чеддер из Сокало , 10x Золотой слиток)
Travel the world to find Rats (literally critters with "Rat" as their names), target them, and use the Чеддер милосердия to complete your Дар сыра achievement and eventually be rewarded with Роланд.
Patch 10.1.5 addition: When you summon Роланд on a character with Кулинария Драконьих островов skill 50 (and at least one of the recipes unlearned), our befriended Recipe Rat will now train them the recipes for Дьявольски перченые яйца and Чеддер милосердия without needing to locate him again in Zskera Vaults or Zaralek Cavern.

Kudos to Kamboozle for sharing the Squeaking Swiss find on the Secret Finding Discord.

Комментарий от AlexisJay

This item is used to get Дар сыра which rewards Роланд Youtube guide - https://youtu.be/4t074il6Aig

Steps to get Роланд:
1. Be sure that you have levelled your dragon isles cooking to at least 50.
2. Go to Мивана in Orgrimmar (coordinates 39,48) or Илана Триас in Stormwind (coordinates 66,73) and buy 2-3 stacks of Кусок старого чеддера.
3. Go to the Obsidian Rest in Zaralek Caverns and loot Скрипящий сыр which is found in a crate at coordinates 52,26. It is at the ground floor level and not the first floor.
4. You now have 1 fine aged cheddar and a Рецептокрыса. Interact with the rat to grovel at it and it will give you some Клочок рецепта. Keep interacting with the rat until you have 30 recipe scraps. You can interact with the rat once every 5 minutes. The rat will also consume one fine aged cheddar from your bags every 3 minutes. If you do not have any fine aged cheddar in your bags, the rat will disappear and you will have to go loot the squeaking swiss again.
5. After getting 30 recipe scraps, combine these into the Крысий рецепт: чеддер милосердия. Learn it.
6. Buy the ingredients to make 50 Чеддер милосердия from the auction house OR buy the Очень острый чеддер from Курда Масляное Копыто in Highmountain, coordinates 38,78, and Чеддер из Сокало from Корка in Zuldazaar, coordinates 71,29.
7. Travel to Falconhurst in Drustvar and feed the cheese to 50 rats. You can only feed this to critters. You switch on the critter and companions setting from the options menu to see the name plates. Making a macro can help target rats but when you feed rats cheese, they will follow you, so the macro will be useless. Getting into combat will scare away the rats and you can use your macro again (don't worry, the rats will still count for the achievement).
8. Feed 50 rats and you get the achievement and Roland. Gratz!

Комментарий от mindswat

If you end up with extra (like I did) it is safe to delete them as they are not used for anything else.

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