Add the TVP to a skillet, add flour and the ground flaxseed to the TVP, stir for 3 minutes in medium-low heat. Reserve.
Cut the end of the cabbage, then carefully carve it making a hole inside. The cabbage is supposed to be hallow.
Preheat the oven to 200℃ / 400℉.
Make the glazing for the cabbage by mixing in a bowl all the ingredients for the glazing.
Fill the cabbage with the TVP, place it on a baking sheet with the opening facing down, spread the glazing all over the top and sides of the cabbage, cover it with aluminum foil, put it in the oven for 20 minutes.
Meanwhile, prepare the vegetables by adding all the veggies to a large bowl along with all the ingredients for the roasted vegetables and give them a good toss.
After 20 minutes, remove the cabbage from the oven, remove the aluminum foil, brush some more glazing on it, add the vegetables to the baking sheet, around the cabbage, spread the veggies well so they roast better.
Put the tray with the cabbage and veggies back in the oven, this time at 185℃ / 365℉ for 50 minutes to 1 hour.
Remove the cabbage from the oven and serve it hot.