Grilled Asparagus without syrup clove peppercorns

1 pound asparagus spears thin 1 teaspoon olive oil 1/4 teaspoon kosher salt 1/8 teaspoon black pepper freshly ground * 1 x nonstick cooking spray as needed *[...]

1 each shallot peeled and finely minced * 1 teaspoon brown rice vinegar * 5 drops plum vinegar ume plum vinegar * 1 teaspoon maple syrup 1 teaspoon soy sauce[...]