Peel garlic and ginger and add to food processor. Also add chilli, turmeric, trimmed spring onions, peanut butter, 1 lime, coriander, soy and fish sauce. Blitz to a paste. Put chicken in a plastic bag with salt, pepper and give spice. Bash until 1.5cm thick. Cook on a frying pan/griddle pan until cooked through (turn after 4 min).