The first thing we need yogurt. Can fundamentally get any purchase a natural yogurt or sour cream, but with fresh homemade yogurt is healthier and tastier? So use the leaven of Orsik. You can cook in different ways - most importantly temperature. I used brand thermos. Simple design - great result! Fill a portion of the leaven of the...

... pour the milk room temperature, shake well and put in a filled with boiling water in a thermos. Leave for 6-10 hours and get the delicate fresh yogurt! Remove the walk in refrigerator for a few hours.

We need tuna. Fundamentally, you can use either: in oil, in own juice, and not even canned. From tuna in particular will depend on the consistency of the salad. I used tuna in oil, and oil was leaking not much, and you can leave for a while fish and drain off the oil as it should. And then mix the tuna with mustard and yoghurt.

Finely chop the onion, add to the salad. Fundamentally the main ingredient is ready. Now you can store it in the fridge until the hour X. Or serve! For this delicious bread (always delicious! Some fresh, crusty toast or special). The bread must fry using the grill, paninis, toaster, grill pans or on fire.

Now put a piece of bread lettuce and fish salad, close second bread and enjoy...