In a wide, shallow dish, whisk together tamari, sesame oil, honey, rice vinegar, ginger, and garlic.

Add tofu slices to the dish.

Turn the tofu slices to coat them evenly with the marinade.

Cover the dish.

Chill the tofu in the refrigerator for at least 1 hour or overnight to marinate.

Remove the tofu from the marinade.

Pat the tofu slices dry with paper towels.

Lightly oil the tofu slices with cooking spray.

Preheat grill to medium-high heat.

Place tofu slices on the grill.

Grill for 3 to 5 minutes on each side, or until golden brown and grill marks appear.

Alternatively, broil on a foil-lined baking sheet until golden brown, 3 to 5 minutes on each side.