Broccoli and Cauliflower Salad

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1/4 red onion, thinly sliced

2 slices bacon, cut in small pieces, cooked to crisp

1/2 bunch broccoli, cut into small florets (about 1 1/2 cups)

1/2 small head cauliflower, cut into small florets (about 1 1/2 cups)

2 tablespoons sugar

1 tablespoon red wine vinegar

1 teaspoon Dijon mustard

2 tablespoons vegetable oil

1/4 cup mayonnaise

1/2 teaspoon seafood seasoning, such as Old Bay

Kosher salt and freshly ground black pepper