Grilled lobster with Thai herbs, peas and blackened citrus mayonnaise

By Matt Tebbutt From Saturday Kitchen Ingredients 1 lobster (approx. 450g/1lb) For the marinade 1 lemongrass stalk, smashed 4 garlic cloves, finely chopped 1 tsp ginger, peeled and finely chopped 6 tbsp coconut milk 1 bunch coriander stalks, roughly chopped 1 tbsp soy sauce 1 tsp caster …