To cook pizza in the game Grow a Garden, you need to collect specific in-game ingredients and use the Cooking Pot on the island. Different types of pizza require different ingredient combinations:

• Rare Pizza: 1 Strawberry, 1 Pepper, 1 Tomato, 1 Corn
• Legendary Pizza: 1 Corn, 1 Tomato, 1 Pepper, 1 Sugar Apple
• Prismatic Pizza: 3 Bone Blossom, 1 Banana, 1 Beanstalk

Once you gather the ingredients, equip them one by one and add them to the Cooking Pot by interacting with it. After adding all ingredients, press the Cook button to start cooking. If the recipe matches what Chris P. Bacon (the pig chef) is craving, a confirmation will appear. After cooking, you can collect the pizza and offer it to Chris P. Bacon for rewards. This cooking mechanic requires the in-game farming of crops and using the Cooking Pot correctly to make the pizza dishes in the game Grow a Garden.

If the question is also about how to grow a real-life pizza garden, which means growing the ingredients you would need for pizza (like tomatoes, peppers, basil, garlic, onions), that is a different topic. Let me know if that is also needed.