Preheat oven to 350° F.
Grease a medium-size casserole dish with 1 Tbsp. avacado or canola oil.
Combine the orange juice concentrate, Mirin, tamari, and 1 Tbsp. canola oil, brown rice vinegar, garlic, and ginger. Mix well.
Cut the tofu into 1/2-inch cubes and combine it with the orange juice mixture.
Marinate the tofu for 30 minutes, stirring occasionally with a wooden spoon.
Grease a 9″ x 11″ baking dish with the remaining 1 Tbsp. of oil. Pour the tofu and marinade into the baking dish.
Bake the tofu for 75 minutes – gently stirring every 10 minutes or so to bake all sides evenly.
Serve hot as an entree or an appetizer or refrigerate and use cold in salads, sandwiches, or wraps.