Here's a guide on "Old Tastes for Hard", a World Quest in Genshin Impact.
Unlocking the Quest 
1.Location: This quest is typically found in Liyue, specifically within Liyue Harbor.
2.Prerequisites: You should be at a certain Adventure Rank, usually around Adventure Rank 20 or above, to ensure you've had some exposure to Liyue's environment and characters.
3.Completing some initial quests in Liyue might be necessary to unlock this quest, but no specific Archon Quest completion is usually required.
Quest Walkthrough
4.Starting the Quest: Speak with Mr. Zhu inside the Feiyun Slope area of Liyue Harbor. He's often found near an inn or a place where he can fish or relax.
5.Gather Ingrefornts: Mr. Zhu will express his longing for an old recipe or a dish that he loved. Your task is to find or recreate this dish for him.
6.He might ask for ingrefornts like: Slime Condensate (from defeating slimes) Sweet Flower (found in the wild, particularly around Liyue) Sunsettia (a common fruit found hanging from trees)
7.Cooking the Dish: Once you have the ingrefornts, you'll need to cook Sweet Madame or a similar dish. If you don't have the recipe:
8.Sweet Madame Recipe: Can usually be bought from the Good Hunter restaurant in Mondstadt or sometimes from other sources.
9.Return to Mr. Zhu: Deliver the dish to Mr. Zhu. He might share stories or reminisce about the past while enjoying the dish you've prepared.
10.Optional Task or Additional Requests: Sometimes, there might be an additional step where he asks for something else or another small favor related to his past or interests.
11.Quest Completion: After fulfilling his request, Mr. Zhu will thank you for your efforts, sometimes sharing a bit of Liyue lore or his personal history, enriching the game's world.
Quest Rewards
•Adventure EXP: A decent amount, contributing to your rank progression.
•Mora: Standard quest reward for general use.
•Primogems: Around 20 to 40, depending on the quest's complexity.
•Local Specialty: Sometimes, you might get some Liyue specialties as a token of gratitude.
Quest Tips 
•Inventory Check: Before starting, ensure you have space in your inventory for new items or dishes.
•Cooking Proficiency: If you haven't already, it might be beneficial to increase your cooking proficiency or unlock more recipes, which can be handy for these types of quests.
•Exploration: This quest can also serve as a reminder to explore and gather resources in Liyue, as some ingrefornts might be used for ascension, other dishes, or future quests.
•NPC Interactions: Engaging with NPCs like Mr. Zhu not only provides quests but also deepens your understanding of the game's world and its characters.
This quest reflects Genshin Impact's attention to cultural details, with food often playing a central role in character interactions and storytelling, providing a taste of the local cuisine's significance in Liyue's culture.
