I found this recipe for exterminating cockroaches on the internet. I have it saved in my "Occasional Odd Recipes" file on my computer which includes such recipes as Fungicide Recipes for the Garden, Tomato leaf juice to conquer Blackspot on roses, and Homemade Insect repellents.
1In a large pot, let all the ingredients soak for one hour and then stir the solution. The recipe did not indicate if they were to be chopped or whole, so do what you want there.
2Place the pot on a countertop or on the floor before you go to bed. The roaches will smell and find the solution, ingest it and die
Just make sure you do not have pets around who might decide to try it. If you do, I would put a bowl of it under the cabinet or somewhere they could not get to it, or close off the room where it is.
3And you thought this was going to be a dish with veggies and cooked Cockroaches. LMAO