Preheat the oven to 180 °C.
1 Remove the casing from the chorizo. Transfer to a large pan and cook over medium heat, stirring and chopping to break up the meat as it cooks. Set aside.
2 Add the butter to the same pan and sauté the onion until translucent. Add the thyme, cauliflower and broccoli and sauté for 3 minutes. Season with salt and pepper.