In a large bowl combine all the seitan dry ingredients. Mix well with a fork.
Add all the wet ingredients except the vegetable broth. Slowly, add the vegetable broth in. Start with half and then mix. Then continue to add until it reaches a crumbly texture that no longer looks dry. PLEASE NOTE: you will not need to use all the vegetable broth. My exact measurement both times I made it was 93 ml (⅓ cup + 1 tablespoon).
Knead the seitan dough either by hand or in a stand mixer for 10 minutes. Once it is formed into a dough shape into a long cylinder.
Bring a large pot of water with any remaining vegetable broth and at least 3 cups (750ml) water to a boil. Once boiling reduce to a simmer and carefully place in the seitan and simmer for 55 minutes. Cover with a lid and leave it slightly vented.
Once there is about 15 minutes left for the seitan to simmer preheat oven to 350°F (176°C).
Then prepare the glaze by adding all ingredients to a small bow and mixing together.
Add the orange slices and rosemary to a small baking dish.
When the seitan is done simmering carefully remove it with tongs from the pot. Use a sharp knife to gently score the top with diagonal cuts.
Place the seitan on top of the oranges in the baking dish. Brush with glaze, leave a little bit for brushing once the vegan ham is done.
Bake in the oven for 45 minutes. When done the score marks will have opened up and the vegan ham should have a dry appearance.
Brush the remaining glaze over the vegan ham and slice.