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for the burger buns: In a small bowl crumble the fresh yeast and mix with sugar and 4 tbsp. of the warm water, mix until yeast has dissolved completely. In another bowl whisk together flour and salt. Now add the rest of the water and the yeast mixture. Knead until a nice dough comes out. Let it rise for 45 minutes, until it's doubled it's size. Preheat oven to 210°C, prepare a baking tray by putting baking paper on it. Divide dough into 6 same size dough-balls. Brush with the egg yolk and sprinkle sesame seeds all over. Put in the oven for 15-20 minutes. Secret tip: put a small bowl with water on the tray with the burgers, this will prevent them from drying-out!
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for the meat balls: Mix meat with spices. Add cutted onion, mustard and ketschup. Shape your meat balls and put them onto your grill until their done.
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for the ketchup: Wash and remove seed from tomatoes, cut into small pieces. Put in a pan and add all other ingredients. On small heat let it cook vor 1,5-2 hours. Stir sometimes. Last spread through a sieve.
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for the mayonnaise: In a bowl mix together the egg yolk and mustard. While mixing and stiring the whole time with a wire whisk add the oil. Add salt and pepper gustatory. Last mix in the vinegar.
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Prepare the whole burger: Wash and cut the iceberg lettuce, tomatoes, onion and pickled cucumbers. Cut burger buns. Take the bottom and spread with mayonnaise and place the lettuce on top now add the meat ball with cheddar. Place tomatoes and onions on top. Take the top of the bun spread with ketchup. Put all together and enjoy!