Slush Ice is an ingredient in Disney Dreamlight Valley that you will likely encounter far into your journey. and can only be unlocked via completing a specific quest for Remy.
This page breaks down exactly how to unlock Slush Ice, and where you can find it once you do.
How to Unlock Slush Ice
Slush Ice is an ingredient that becomes available during The Unknown Flavor Quest for Remy, which is his final quest upon reaching Friendship Level 10 with him.
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Partway through the quest, you'll need to collect 15 Snowballs from the Frozen Heights region and bring them to a Crafting Station (alongside the Purified Night Shard Potion that you created earlier in the quest) to create Ice Slush.
Bring that to Remy, and Slush Ice will become a permanent ingredient that you can purchase on the back shelf in the kitchen of Chez Remy. This is the ONLY way to acquire Slush Ice, so you'll need to keep your Star Coins stocked up if you're looking to get some!
Looking for more? Check out our How-To hub page for all the best tips and tricks to get past difficult segments, or our Quests hub to ensure you can complete every character's arc.