Spinach Salad with Grilled Peaches

INGREDIENTS

• 1/4 cup buttermilk
• 2 tablespoons vegetable or olive oil
• 1/2 small red onion, thinly sliced
• 1/4 teaspoon sugar
• 4 ripe peaches, pitted and quartered
• 1/2 cup (4 ounces) crumbled Danish blue cheese
• Salt and freshly ground pepper
• 1/2 cup pecans
• 1/2 pound hickory-smoked bacon, roughly chopped
• 1/4 cup sour cream
• 8 cups baby spinach