Orange Vinaigrette:
Pour orange juice in small nonreactive pan, and cook over high heat. Bring to a boil and cook until reduced to ¼ cup, about 35 to 40 minutes.
Place orange reduction, balsamic vinegar, onion, and jalapeño in a food processor fitted with metal blade, process until smooth.
With the motor running, slowly add olive oil until emulsified. Add the honey, salt and pepper, process 2 seconds.
Salad:
Heat ¾ cup of orange vinaigrette in a medium skillet over medium high heat.
Add apples, and sauté until golden brown, turning until just cooked through, 2 to 3 minutes. Remove from heat; spoon apples on a plate and cool to room temperature.
Place endive in mixing bowl, toss with 4 tablespoons of remaining orange vinaigrette, season with salt and pepper, if desired. Divide endive among 4 salad plates.
Arrange 4 apple slices on each plate, garnish with pecans and blue cheese. Drizzle with remaining orange vinaigrette.