Cook the pasta according to package instructions al dente. Then leave the pasta to cool.
Slice the sausages into 1-2 cm pieces.
Chop the gherkins into small bits as well.
Drain the liquid of the peas and carrots.
In a small bowl combine the mayonnaise, mustard and gherkin water and mix until you have a smooth paste.
Once the pasta has cooled, (the pasta can be lukewarm) mix in the gherkins, vegetables and sausages.
Now add the salad dressing and mix it in with the rest of the ingredients.
Mix in the fresh herbs if using.
Season the salad with salt and pepper to taste.
It is best to leave the salad to rest for around 20 minutes so the pasta can absorb the flavors. For the best result, leave it to soak overnight.
Notes
Make ahead
This is a great dish to make in advance. Make sure you store it in the fridge. It tastes great after it sat in the fridge overnight. However, it could be that the pasta salad absorbs all the moisture of the dressing with time. You might need to refresh the dressing with a little more mayonnaise or pickled gherkin water.
How to store?
I would recommend storing this pasta salad in the fridge for up to 5 days. However, it will taste best if you consume it in the first two days of making it.
Can you freeze pasta salad?
Do not freeze this salad. Firstly, mayonnaise does not freeze well. Secondly, the pasta might get too soft when being defrosted so it may end up in a soft mess.