Place butter and flour into the Thermomix bowl. Cook 5 min/Varoma/speed 3. Set aside. This is your roux.
Place onion, garlic, carrot, celery and EVOO into the Thermomix bowl. Chop 3 sec/speed 5. Cook 10 min/Varoma/speed 1.
Add wine, tomato paste, fish stock, bay leaves, tarragon, thyme and the roux to the Thermomix bowl. Cook 15 min/100°C/speed 1. Remove bay leaves.
Blend 1 min/speed 8. Repeat.
Add prawns. cook 2 min/100°C/Reverse/speed 1. Alternatively, fry the prawns in butter to get that caramelised flavour. Salt them well.
Add lemon juice and corn. Season to taste. Stir to combine.
Serve immediately, garnished with fresh herbs of choice, we used thyme.