Marinate your prawns in garlic, zest of the lemons, chopped coriander, olive oil, chilli and salt and pepper. Make sure to mix well and place in the fridge until ready to use.
While the prawns are marinating make the aioli. Place the garlic, saffron and wine in a small saucepan. Bring to the boil and reduce until there's about half a teaspoon left. Remove from the heat, cool for a few minutes then mix with the mayonnaise and refrigerate until ready to use.
When you're ready to cook the prawns heat a grill pan over a high heat and cook the prawns for a couple of minutes on each side making sure not to overcook. Top with a big squeeze of lemon juice, serve with the saffron aioli and some fresh bread.