This is a very loose recipe. It is difficult to give exact quantities as heads of broccoli vary wildly in size. Adjust it according to how much broccoli you wish to serve. The quantities below will be sufficient for the shop standard broccoli head. If you really don't think you can go with the anchovies, leave them out. The broccoli will still taste great roasted with garlic. Just add an additional clove of garlic and make sure you season well with salt. If my broccoli head comes with the leaves attached I keep these on and roast them as well. They go crispy in the heat and are great to eat.