Cook macaroni according to directions on package.
In a separate bowl, combine mayonnaise, relish, celery seed, lemon juice, salt & pepper. Stir well to combine.
Stir in tuna.
Once macaroni is cooked, drain well and rinse with cold water until pasta has cooled. Pour drained macaroni into a large bowl.
Pour mayonnaise mixture onto pasta.
Then add chopped eggs and shallot, followed by thawed peas. Stir well.
Cover bowl with plastic wrap.
Put bowl into the fridge for a couple of hours, then serve.