Grilled Chicken and Nectarine Salad

pecan halves

salad greens (8 oz.), rinsed and crisped

vegetable oil

walnut oil (or more vegetable oil; see

white wine vinegar

boned chicken breast halves with skin (2 lb. total), rinsed, patted dry, and fat trimmed

Salt and pepper

firm-ripe nectarines (12 oz. total), rinsed, pitted, and thinly sliced

fresh chèvre (goat cheese), crumbled