How to make
Shred the cauliflower and broccoli into florets and cook them (if possible) with steam, having placed some salt in the water.
From the oil and flour, prepare a roux, dilute it with hot vegetable broth until you get a thick and flavorful sauce.
Season with salt and pepper. Serve the florets of cauliflower and broccoli with plenty of the warm sauce over them and sprinkle with plenty of dill.