Place the barley in a pan that has a lid, cover with water, place the lid and leave to cook for at least thirty minutes while you prepare the other ingredients.
While the barley cooks chop the fennel, carrot and red onion, place in a dish in the oven at 180 degrees, for twenty minutes, checking after fifteen.
Once the barley is cooked, drain the water and place the pan back on a medium heat, immediately adding the quark and lemon juice, stir them together and add the cheddar. Keep stirring until the cheddar is melted then add the vegetables. And serve, garnished with some coriander if you like.