Preheat a grill or BBQ to medium-high.
In a skillet placed over medium heat, warm the olive oil and sauté the onions until caramelized (about 10 min).
2 tbsp. olive oil, 4 to 6 red or yellow onions
Add the honey, if using, and stir until dissolved then add the vinegar and the wine.
3 tbsp. balsamic vinegar, 3 tbsp. red wine, 2 tbsp. honey
Simmer until all the liquid has evaporated (about 10 minutes), and season to taste.
Sea salt and freshly ground black pepper
Grill the chicken breast on the preheated BBQ until done (about 5 minutes per side).
4 boneless
Place the pineapple slices and the jalapeño slices on the grill and grill them for about 2 min.
4 pineapple slices, 2 fresh jalapeño peppers
Top each chicken breast with jalapeño, pineapple, and onion relish, and serve.