Preheat oven to 375F. Put casserole dish and oil in to heat too.
Cut tempeh into 1" strips, or however wide you want your 'ribs'. I managed 6 riblets from my package.
Toss the tempeh with cornstarch to coat lightly.*
Spread the riblets evenly across the bottom of your hot casserole dish, put in oven for 5 minutes or so.
Mix all remaining ingredients.
Turn the riblets, pour the sauce over top, and cover tightly.
Bake for 30 minutes. Turn the riblets and baste with liquid.
Re-cover, and bake another 25 minutes.
Baste again. Bake uncovered for five to ten minutes more, until the sauce is quite thick.
