Tuna & cucumber sandwich

wheat flour 52.0% , tuna 24.0% , water 12.0% , cucumber 6.0% , Low Fat Natural Yogurt 3.0% , malted wheat flakes 1.5% , wheat bran 0.8% , corn flour 0.4% , Fromage Frais 0.2% , spirit vinegar 0.1% , wheat gluten 0.0% , yeast 0.0% , Emulsifier 0.0% , salt 0.0% , barley malt flour 0.0% , rapeseed oil 0.0% , egg 0.0% , white wine vinegar 0.0% , malted wheat flour 0.0% , Gelling agent 0.0% , black pepper 0.0% , mustard seed 0.0% , Flour treatment agent 0.0% , concentrated lemon juice 0.0% , palm oil 0.0%