To make sushi in the Roblox game Grow a Garden (GAG), you need to gather the right ingredients and use the Cooking Pot in the lobby. The standard sushi recipe requires 4 Bamboo crops and 1 Corn crop. You add these ingredients to the Cooking Pot by pressing the E key and then click "Cook." After about 7 minutes and 21 seconds, you collect your sushi by pressing E again. This is the base sushi recipe in the game. There are also multiple rarity variations of sushi with different ingredient combinations involving Bamboo, Corn, and special items like Bone Blossom and Hive Fruit for prismatic and divine sushi types. For example:

• Normal Sushi: 4 Bamboo + 1 Corn
• Legendary Sushi: 3 Bamboo + 1 Corn + 1 Hive Fruit
• Prismatic Sushi: 1 Bamboo + 1 Corn + 3 Bone Blossom
• Divine Sushi: 1 Bamboo + 1 Corn (or Violet Corn) + 3 Bone Blossom

The specific recipe depends on which sushi rarity you want to make or what ingredients you have available in your game inventory. Players submit sushi to the NPC chef Chris P for rewards, with the chef's cravings changing hourly. If the query was about a "sushi gag" outside of the game context, that term is not clearly defined here, but in Grow a Garden, "GAG" stands for the game name itself—Grow a Garden—so it is related to making sushi in that game.