Preheat griddle to medium-high heat in one zone and medium heat in the second.
In a bit of oil, saute the onion and celery on the medium zone until starting to soften.
On the medium-high side, cook the sausage slices until starting to brown and release some juices.
Add the shrimp to the hot griddle side and sprinkle with seasoning.
Cook until just beginning to turn pink, then flip and begin to incorporate the sausage, shrimp and veggies.
To the side, add the okra and cook until softened and beginning to brown.
Combine all the cooked ingredients in one area.
Alongside the cooked ingredients, pour the rice and add a bit of oil.
Fry the rice until heated through and beginning to brown.
Then combine the rice with the other ingredients and mix well.
Add the chopped tomatoes, mix to combine.
Add the garlic and incorporate.
Season the dish to taste and continue cooking until tomatoes break down a bit and flavors meld.
Transfer the dish to a platter and top with chopped green onions.
Serve your Jambalaya hot off the Traeger Flatrock and enjoy!