If you are not using eggs, whisk the psyllium husk in a small bowl, with ⅓ cup of water. Set aside for 30 minutes, or until the liquid thickens and turns gel-like.
Preheat the oven to 180c. Prepare the oven dish by lining up a baking paper and slightly oiling with olive oil.
If you are using eggs, ignore the psyllium husks and just whisk the eggs in a bowl
In a medium bowl, whisk together the cornmeal, salt, baking soda..
In a large bowl, whisk together either eggs or the psyllium husk gel, buttermilk, olive oil and lime juice.
Add the cornmeal mixture to this and whisk them altogether.
Finally add the fresh herbs, grated zucchinis and carefully mix them into the batter. If you are using cheese, add them as well and carefully mix until incorporated.
We are looking for a consistency that is thicker than pancake batter. If the texture and consistency need adjusting, gradually add more cornmeal (if too thin) or more buttermilk (if too thick).
Pour the batter into a baking dish and decorate with sesame, nigella and sunflower seeds
Bake for 40-60 minutes, until set, light brown in the center, and deep golden brown around the edges.
Carefully remove the cornbread from the dish and let it cool on a wire rack for 10–15 minutes before slicing and serving.