Grilled Peach, Onion, and Bacon Salad

Salad:

• 1/2 lbs thick-sliced bacon
• 2 tbsp brown sugar
• 1/4 tsp cayenne pepper
• 1.5 lbs sweet onion Vidalia or other, cut into 1-inch thick slabs
• 2 tsp olive oil
• 4 medium peach ripe but firm, yellow, cut into 1/2-inch wedges

Dressing:

• 1/2 cup buttermilk
• 1/2 cup sour cream
• 1/4 cup tarragon finely chopped fresh tender herbs mixed
• 1/4 cup chive
• 1/4 cup parsley
• 1/4 cup dill
• 2 tbsp lemon juice fresh
• 1 small garlic finely grated or minced from clove
• 1 pinch kosher salt
• 1 pinch black pepper ground