Rinse the cauliflower head and dry. Then divide it into small bouquets, about 2-3 cm in diameter.
Mix flour, cornstarch, and beer in a bowl to a sticky batter. Heat the oil in a deep fryer or saucepan to 190 degrees, leave to medium heat.
Dip the bouquets in the batter so that they are properly covered. Then fry, a few at a time, until they get a nice golden color. Drain on paper towels.
Mix passed tomatoes and sriracha sauce together. Dip the bouquets in the hot salsa. Serve with mild dips or with rice and vegetables for a complete meal.