The Pro-Tip To Give Your Dunkin' Refresher More Flavor - Tasting Table
Briefly

If you wish your Dunkin' Refresher had more flavor, simply ask the staff for extra concentrate, which enhances the drink's fruity sweetness and flavor.
Users on Reddit have found that asking for more concentrate is a game changer; some Dunkin' locations might even give an entire cup full at no charge.
Another way to amplify the taste is by requesting lemonade mixed into your Refresher; adding plant-based milks can also elevate the flavor experience.
While the mango pineapple Refresher is among the least recommended options, it's often too sweet and lacks a balanced flavor between the two fruits.
Read at Tasting Table
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