Start by opening the can and placing the asparagus pieces in a sieve with a bowl underneath.
The soup is (in essence) a thin, thickened sauce.
Therefore, start by melting the butter in a pot over medium-high heat.
Add the flour one tablespoon at a time while whisking.
Then add the asparagus water while whisking vigorously.
Add the soup gradually, and once all the soup/broth is in, let it boil for a couple of minutes.
Then pour in the cream and heat the soup until it boils.
Taste and adjust with salt (if using soup, a considerable amount is needed), white pepper, lemon juice, and apple cider vinegar.
Now add the asparagus pieces and let them heat through for a minute.
Then add the frozen meatballs.
The soup will stop boiling as the frozen meatballs lower the temperature.
Heat the soup until just before boiling, and it's ready.
The meatballs must not be boiled.
Serve immediately, preferably with a good piece of bread.