Press tofu for 20 minutes. Slice into 1/4-inch-thick slabs and transfer to a large bowl.
Whisk together tamari and oil and season with salt and pepper.
Drizzle dressing over tofu and marinate 20 minutes, tossing occasionally.
Heat oven to 350 degrees. Arrange tofu on an oiled baking sheet and bake 10 minutes. Flip and bake 30 minutes more. Let cool.
Refrigerate tofu in an airtight container up to 3 days.