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Cut the chicken breasts in half horizontally and lay each between two sheets of cling film. Bash with a rolling pin until about 1cm thick.
Squeeze lemon juice over the chicken and dust with the paprika. Season with salt and pepper, and drizzle with a little olive oil. Lay on a hot griddle pan or barbecue and cook for 3-4 mins on each side until charred and cooked through.
Halve the ciabatta horizontally and lay, cut side down, on the pan for 1 min. Mix the crushed garlic and mayonnaise, then spread over the cut side of each ciabatta half. Top with the lettuce and chicken, then season with a little salt and pepper. Cut in half to serve.