Slice each block of tempeh in half so that you have four thin rectangles. Cut each of these rectangles into four triangles, sixteen triangles total.
Fill a steamer pot with water and steam the tempeh for 10 minutes.
As the tempeh is steaming, make the sauce. Add maple syrup, organic brown sugar, tomato paste, apple cider vinegar, soy sauce, sesame oil, and chili garlic sauce to a bowl and whisk together until smooth.
Drain the tempeh and let it air dry to get rid of excess moisture.
Add canola oil to a skillet and heat on medium-high. Place tempeh triangles in the skillet and cook until browned, about 5 minutes. Flip the tempeh over and cook for another 5 minutes. You may have to cook the tempeh in multiple batches and add more oil depending on the size of your skillet.
Turn the heat down to medium-low and add the sauce. Coat tempeh evenly in the sauce. Heat until the sauce is slightly bubbly and the sugar has begun to caramelize.
Serve over rice with your favorite stir-fried vegetables. Spoon some extra sauce over the tempeh and garnish with sesame seeds.