Heat the oil in a large frying pan until just sizzling. Increase the heat, add the prawns and fry until cooked through (about 3 minutes). Add the lemon juice, garlic and chilli and stir to combine. Remove from the heat and set aside.
For the salad, heat the oil in a medium pan and add the garlic, frying for 1-2 minutes until lightly coloured. Add the blanched beans and stir to combine.
To serve, add the prawns, a portion of the sauce and salad to individual bowls. Remove the heads from the prawns and squeeze all the wonderful juices into the sauce.