Caramelized Onion Blackberry Tartlets

Ingredients

• 1 package Blackberries cut in half crosswise
• 2 tablespoons fresh sage, very thinly sliced
• 2 tablespoons vegetable oil
• 2 medium yellow onions, chopped (about 4 cups)
• 3 teaspoons Celia's Blackberry Ginger White Balsamic Vinegar
• Kosher salt and freshly ground black pepper
• 1 cup all-purpose flour
• Pinch of salt
• 7 tablespoons unsalted butter, cut into tablespoons, at room temperature, plus more for the pans
• 3 ounces cream cheese, cut into tablespoons, at room temperature
• 4 bacon slices, preferably maple cured
• 1 tablespoon grade B pure maple syrup