Melt the butter in a saucepan. Slowly add the whole wheat flour. Keep adding until it forms a loose paste. Slowly add the chicken broth. Let that simmer for a little. Add the tomato, spinach and parmesan cheese. At this point the sauce should be thickening up. I usually let it simmer at this point. I tend to add the spices towards the end of cooking. I prefer the stronger taste of the garlic and other spices. But, it is completely up to you- you could certainly add the spices at the very beginning.