Start by preheating the oven to 175 degrees celcius or 350 farenheit.
In a bowl add the olive oil and the spices (fenugreek, nutmeg, cumin, coriander, oregano, cinamon) and minced garlic. Add salt to taste, mix well.
Once you've cut the cauliflower (and brocolli & romanesco) in bite size pieces you can toss them in the bowl with the spices until they are evenly coated.