Broccoli and Cauliflower Salad

INGREDIENTS

• 1/2 small head cauliflower, cut into small florets (about 1 1/2 cups)
• 1 teaspoon Dijon mustard
• 2 tablespoons vegetable oil
• 1/4 red onion, thinly sliced
• Kosher salt and freshly ground black pepper
• 2 tablespoons sugar
• 1/4 cup mayonnaise
• 2 slices bacon, cut in small pieces, cooked to crisp
• 1 tablespoon red wine vinegar
• 1/2 teaspoon seafood seasoning, such as Old Bay
• 1/2 bunch broccoli, cut into small florets (about 1 1/2 cups)