Triple Smoke Burger

INGREDIENTS

• 8 bacon slices
• 2 teaspoons sweet smoked paprika
• 1 1/2 pounds ground beef chuck (not lean)
• 1 1/2 tablespoons Dijon mustard
• 1/2 cup mayonnaise
• lettuce; cilantro sprigs
• 2 tablespoons minced chipotle in , including some sauce, divided
• Olive oil for brushing on onion and avocado
• 4 hamburger buns, grilled or toasted
• 1 large red onion, cut into 4 (1/2-inch) thick rounds, each stuck with a wooden pick to keep it together
• 1 firm-ripe avocado, quartered lengthwise, peeled, and cut lengthwise into 1/3-inch thick slices