Better than AI: ask someone who has ordered lots of piazza recently.
You need more than you think as not all pizzas will be the same flavour. The vegetarian ones will get eaten immediately by people who aren’t vegetarian. Then the complaints roll in.
Cheese pizza is acceptable to vegetarian and meat eaters alike. Barring a disproportionately vegetarian crowd, most groups would be perfectly happy with 50% cheese pizza and 25% each veggie or meat combo/pepperoni. The less sure you are about people's dietary preferences, the higher you crank the cheese %.
If it turns out there's a huge population of like gluten free, you say "Ah my bad" and correct the next time.
You need more than you think as not all pizzas will be the same flavour. The vegetarian ones will get eaten immediately by people who aren’t vegetarian. Then the complaints roll in.
Apply this to various other pizza type.
Order 1 pizza for every two people.