Step 1

Put the potatoes in a large saucepan and cover with cold water; season with 1 teaspoon salt. Bring to a simmer over medium-high heat and cook, stirring occasionally, until tender, about 10 minutes. Drain well and transfer to a large bowl. Add the vinegar and 1/2 teaspoon salt; toss to coat well. Let cool slightly, about 10 minutes.

Step 2

Meanwhile, whisk the vegan mayonnaise, vegan sour cream, cornichon brine, vegan mustard and several grinds of black pepper in a small bowl until smooth and combined. Stir in the parsley, cornichons, celery and scallions to combine.

Step 3

Pour the creamy dressing over the potatoes and gently toss with a rubber spatula to combine. Taste and adjust the seasoning with salt and pepper. Cover and refrigerate until chilled through, at least 2 hours and up to overnight.

Step 4

Sprinkle with paprika before serving.