To make ice cream in Grow a Garden, you need to use specific plant ingredients and cook them at the Cooking Pot in the center of the island. Here is how you can make various rarities of ice cream:

• Uncommon Ice Cream: 1 Corn + 1 Blueberry or 1 Strawberry
• Rare Ice Cream: 1 Watermelon + 1 Corn or 1 Blueberry + 1 Banana
• Legendary Ice Cream: 1 Banana + (1 Watermelon or 1 Apple) or 1 Mango + 1 Corn
• Mythical Ice Cream: 1 Banana + (1 Pepper or 1 Loquat) or 1 Corn + 1 Sugar Apple
• Divine Ice Cream: 1 Sugar Apple + 1 Sugarglaze

How to cook:

1. Go to the Cooking Pot at the center of the island.
2. Equip the ingredient you want to add and interact with the pot to add it.
3. Add all ingredients to the list on the left.
4. Press the Cook button to start cooking.
5. When done, interact with the pot to get your ice cream.
6. If Chris P. Bacon is craving ice cream, give it to him to get rewards.

The combination you choose determines the rarity and the rewards you get. It's best to cook ice cream when Chris P. Bacon specifically craves it to maximize benefits. This method covers making ice cream from common to divine rarity using plants you grow or find in the garden area in the game Grow a Garden.