How do you stop pea and ham soup from becoming sour?

There are several factors that can cause pea and ham soup to become sour. Here are some tips to prevent it from happening:

- Use fresh ingredients. Make sure the peas and ham are fresh and of good quality.

- Cook the soup thoroughly. Bring the soup to a boil and then simmer for at least 15 minutes. This will kill any bacteria that may be present and prevent the soup from souring.

- Add an acid. Adding a small amount of acid, such as lemon juice or vinegar, can help to balance the flavours of the soup and prevent it from becoming too sweet.

- Store the soup properly. Let the soup cool completely and then store it in an airtight container in the refrigerator. It will last for up to 3 days in the refrigerator.