Caramelized-Onion Dip with Vegetables

Heat oil in a large nonstick skillet over medium heat. Cook onions with 2 teaspoons salt, stirring often, until caramelized, 35 to 40 minutes.

Add water; cook, scraping any brown bits from bottom to deglaze skillet. Transfer onions with brown bits to a medium bowl; let cool for 30 minutes.

Stir yogurt, sour cream, lemon juice, and cayenne into onions. Refrigerate for at least 1 hour. Sprinkle with cayenne. Serve with vegetables.