The recipes for Spaghetti and Meatball/Shrimp have to be followed exactly as the recipe tutorial showed upon introduction of the pasta ingredient.
The next time a customer asks for any pasta dish, tap and hold your finger on the order bubble of a customer with a pasta order. This will reveal the exact order you must grab the ingredients in order to successfully create the requested dish.
For example, to make Spaghetti n' Meatball, follow these instructions:
1. tap on the pasta dough on top of the bass drum to make it
2. tap on the meatball to collect it
3. tap on the pasta you just made
4. tap on the required sauce (marinara or alfredo)
5. tap on the green oven pad to make!