Horseradish Mayo

From Bon Appetit.
Ingredients:
1 cup mayonnaise
1/4 cup (or more) prepared horseradish
2 teaspoons white wine vinegar
Kosher salt
Freshly ground black pepper
1 tablespoon chopped fresh tarragon

Whisk mayonnaise, 1/4 cup horseradish, and vinegar in a small bowl to blend. Season horseradish mayonnaise to taste with salt, pepper, and more horseradish, if desired. Fold in tarragon.