Clean, wash, pat dry the fish and cut into 12 equal cubes. Mix the vodoo spice with the olive oil and coat the pieces of fish and prawns with it. Stick fish and prawns alternately on skewers. Mix the lime juice with the grated zest and sprinkle the skewers with it, then let it rest for a moment.
Chop the garlic very finely and mix it with the sour cream. Season to taste with lime juice, lime zest, salt and pepper.
Lightly salt and pepper the skewers, grill and serve with the dip and fresh white bread.