Just like in Breath of the Wild, saving Hyrule in The Legends of Zelda: Tears of the Kingdom is also about helping the inhabitants within, no matter how minute their problems seem. In Kakariko Village, Link will encounter several such Side Quests, like helping a family-run business get back on its feet. Here's exactly how to do that by completing the 'Gloom-Borne Illness' Side Quest in Tears of the Kingdom.
Triggering the Gloom-Borne Illness Side Quest
To trigger the Gloom-Borne Illness Side Quest, the player should first head to Kakariko village at coordinates 1845, -0969, 0115. Heading to the armor shop, players should then ask Claree about her grandmother's illness and then speak to Lasli, who is just above the armor shop on a slope next to a cooking pot at 1908, -1004, 0127. Lasli will give Link most of the recipe for the porridge to save her grandmother - Hylian Rice, Fresh Milk, and Wild Greens.
Solution to the Gloom-Borne Illness Side Quest
'Wild Greens' is a vague category that doesn't correspond to any actual item in the game. The 'Wild Greens' Lasli is talking about are Sundelions, an important flower that restores hearts lost to gloom. Making a porridge with these three ingredients will restore their grandmother to full health.
Where to Find Hylian Rice and Fresh Milk
For such seemingly common items, Hylian Rice and Fresh Milk can actually be quite difficult to find. The best place to find both ingredients is Hateno Village General Store at coordinates 3356, -2517, 0018 for 12 Rupees apiece.
Where to Find Sundelions
Sundelions are semi-difficult to find, as they are only available in the Sky Islands. That being said, there are some guaranteed spots to find them. Sundelions grow most commonly in the Sky Islands above Gerudo and Akkala, seeming to favor hotter climates. Catapulting Link into the sky around these areas is the best way to find Sundelions.
Giving the Porridge to Lasli
Once Link has combined the three ingredients into Sunny Veggie Porridge, the player should return to Kakariko Village and speak to Lasli again, who will notice that Link has a Sunny Veggie Porridge on him and trigger a cutscene where her grandmother eats it and is restored to full health.
Rewards for Completing the Gloom-Borne Illness Side Quest
For such a relatively simple quest, the rewards are huge. While the Energizing Porridge that Lasli gives Link is a nice bonus, the real prize is the lowered prices of the Radiant and Stealth Armor Sets. When Link first enters the armor shop, each piece of each armor set is priced at 5,000 Rupees, an unbelievable amount for any armor set. Once Lasli's grandmother's health is restored, the prices drop to significantly more reasonable ones.
The Legend of Zelda: Breath of the Wild is available for Nintendo Switch.