Make the pickled cabbage, this can be done days ahead. Roast fennel seeds in a pot. Add vinegar, sugar and chill flakes and let it simmer until all the sugar has been dissolved. Remove the outer leaves and stalk of the cabbage.
Use a sharp knife to finely slice the cabbage. Add as much cabbage as possible in the jar, it is okay to squeeze a bit. Pour the hot liquid over the cabbage and add the lit tightly. Gently shake the jar to soak all cabbage in vinegar. This can be done every 15 min until the cabbage start collapsing a bit.
Make the remoulade. Start by mixing creme fraiche, mayonnaise, mustard, curry, turmeric, sugar and vinegar. Add the remaining ingredients and mix all of it together. Use vinegar, sugar, salt and pepper to season to taste.
Prepare the rest of the ingredients. Fry or grill the sausages and heat the flatbreads. Then serve the hotdogs as a pick and mix your own food. Add all things to the table and eat while you make your own delicious versions of grain free super hotdogs. Start with the bread, a lettuce leave then the sausage and top with the ingredients you prefer.