Combine the oil, lemon zest, tequila, beer and chilli. Thread the prawns onto the skewers, brush with a little marinade. Brush the spring onions with the remaining marinade, cover both and marinate for approx. 20 mins.
Charcoal/gas/electric grill: Cover the skewered prawns and spring onions and grill for approx. 3 mins. on each side over/on a very high heat (approx. 250 °C, season. Scatter the coriander and peanuts over the top, drizzle with olive oil.