Slice the 3 red onions, mince the 2 garlic cloves, 1 tablespoon fresh thyme, and 2 tablespoons fresh basil; slice the large baguette into crostini-sized pieces.

Heat the 3-quart saucepan over low heat and melt 2 tablespoons butter.

Add the sliced red onions, minced garlic cloves, fresh thyme, and 1/4 cup sugar to the melted butter. Season with about 1/4 teaspoon sea salt.

Stir the onion mixture well and cover the saucepan. Cook over low heat for about 25 minutes until the onions are soft and beginning to caramelize.

Remove the saucepan from the heat and stir in 1/4 cup dry red wine and 1 tablespoon apple cider vinegar. Set the onion jam aside.

Preheat the oven or grill to 350°F (175°C). Line the baking sheet with parchment paper.

Arrange the 4 duck confit legs skin-side up on the lined baking sheet. Roast or grill for 8 to 10 minutes until the skin begins to crisp and the meat pulls apart easily.

Remove the cooked duck confit legs from the heat and shred all the meat with 2 forks. Discard the bones and skin if desired.

Brush the baguette slices with about 2 tablespoons olive oil and season them with the remaining sea salt and cracked black pepper.

Grill the seasoned baguette slices until grill marks form and the bread is golden, about 2 to 3 minutes per side. Alternatively, toast them in the oven until golden.

Spread Cranberry Pepper Boursin cheese over each toasted baguette slice. Top each crostini with shredded duck confit and onion jam.

Garnish the crostini with 1/4 cup pomegranate arils and 2 tablespoons fresh basil. Serve warm or at room temperature.