There are usually two culprits - not draining off wet ingredients and/or adding too many watery vegetables. For this recipe, cook the noodles first so they have plenty of time to drain. Remember to drain off the package of tuna as well.u003cbr/u003eu003cbr/u003eCelery and onion won’t release too much liquid when diced, but you may need to reduce the amount of mayo if you add veggies like cucumber, pickles, or tomatoes.