No Mayo or Ketchup.
There are recipes in the book to make white sauces with either fromage frais with herbs or with mustard. You could also use some eggs or just yolks and mash them up with some fromage frais and mustard. I know the book starts the recipes with a selection of sauces for exactly that reason, and ther must be some in the recipes here too. As I said my standards are variations based on fromage frais or quark. Made Ketchup is a no-no, even the low sugar etc because it usually has thickeners. If you have to have it you're limited to about one tablespoon a day as a 'tolerated item'
Oh and NO sausages: Too high in fat and other carby additives even the low-fat versions. The one Dukan himself allowed as tolerated are 'Merguez' - they are a speciality north african type sausage available in France. They're tiny and I think one is a tolerated item. Herta poulty sausages are allowed, one a day as a tolerated item I think.
Coca powder - stay clear of anything pre-mixed, sachets, light, weight watchers etc. The ONLY thing allowed is the fat reduced cocoa powered - thats a cooking ingredient and the only type available in the UK is Tesco Value. Other brands are no fat-reduced. But not all Tescos stock it, I've never seen it. Again one level teaspoon counts as one tolerated item.
More info on tolerated items (you can have a maximum of two a day) and any foods you think you might tor might not be allowed to have: look in the FAQ that is pinned to the top of the thread. The main rule - stick to basics. Make it yourself from the permitted foods. If it's not on the list then it's not allowed. And definitely stay clear of anything that already premixed, pre- prepared etc they all have hidden sugars, carbs, thickeners etc etc. And 'no carb' usually means there is fat in it. 'No fat' usually means there is sugar in it etc etc. It's a minefield so stick to basics, life is much easier that way.
Finally you're a week or two into the diet, all these 'extras' and 'tolerated items' should only really be considered when you reach the point of extreme boredom or when you might crack and give in to a completely unallowed treat or worse. If you're already craving sausages, ketchup and chocolate then this might not be the diet for you. Sorry if that is not helpful thing to say but I've watched you ask question after question here and I am wondering about your motivation.