Potato Salad Fra Diavolo

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2 1/2 pounds baby Yukon gold potatoes, halved

Salt

1 tablespoon ground fennel

1 tablespoon smoked sweet paprika

2 tablespoons chili powder

1 tablespoon grill seasoning or coarse salt and pepper

2 tablespoons grainy mustard

2 tablespoons red wine vinegar

1/3 cup extra-virgin olive oil

1 small red onion, chopped

3 to 4 ribs celery with leafy greens, finely chopped

A generous handful fresh flat-leaf parsley, coarsely chopped

3 tablespoons chopped yellow hot pepper rings