Add all ingredients for the Carrot Tahini Burger Patties into a large mixing bowl. Mix with a wooden spoon until combined. Separate the mixture into four, and mould into rough patties. They will be quite thick, about 1 1/2 cm.
Heat a large frying pan on medium heat. Add enough oil or butter to coat the pan. Add in the four patties. Cook for 5-6 minutes until golden on the bottom side. Carefully flip and cook the other side for about 5 minutes, until the patties are cooked through. Once cooked, set aside.
To make Cucumber Tzatziki, combine cucumber, dill and yoghurt together in a small bowl. Set aside.
Now to assemble the burgers. Layer each burger bun base with radicchio leaves, a Carrot Tahini Patty and a good dollop of Cucumber Tzatziki. Place the bun top on, and serve.