You will require a new model to make all the ingredients and the toppings available. Then, you would require a controller that would be the entry point for your application, and which would control the cooking process. To wrap up things, you require a view to which you will pass on the data from the controller, and your cooking will conclude.
This time, creating a new model is not at all difficult.
You just need to create a new PHP class inside the <project-root>/module/Application/src/Application/Model directory in just the same way as you have done all the while.
Name it Cooking, and set the namespace as Application\Model. The purpose of your model class will be to supply the ingredients to facilitate the cooking process.
Your model will look somewhat like the following code:
namespace Application\Model;
class Cooking {
/**
* Get the ingredients that will be added to your dish
* @return array Containing the list of ingredients...