In a bowl, combine mayonnaise, lemon juice, and mustard. Stir until smooth and confident.
Add chopped pickles, capers (if using), and shallot. Mix until evenly distributed. Don’t overmix—let some texture shine.
Fold in parsley. Give it a few quick stirs, then season with salt, pepper, and a touch of sugar if you like a touch of sweetness.
Cover and chill for at least 15 minutes. This lets flavors mingle like they’re at a high school dance.
Give it a final stir, taste, and adjust. More lemon if you want brighter, more salt if you’re feeling shy.