Combine sugar, yeast, and warm water in a large mixing bowl. Whisk together and set aside for 5 minutes. Add flour, salt, butter, and Kombucha gradually to the bowl, mixing the ingredients from the outside in until doughy. Remove mixture from bowl and knead on a floured surface for 3-4 minutes. Slightly oil the empty mixing bowl to prevent sticking, and place the dough back into the bowl, shaping the dough into a circle. Cover bowl with a kitchen towel and place in a warm area to let rise for one hour. Preheat oven to 425 degrees F. Bring 10 cups of water to a boil with baking soda in a large pot. While the water is boiling, prepare a cookie sheet with a piece of parchment paper. Remove dough from bowl and cut into 8 equal sized pieces. Roll dough into a rope about 20” long. Shape pretzels by taking the ends and crossing over twice. Bring ends down and tuck gently under the bottom to make a pretzel shape. Drop pretzel dough two at a time into boiling water for 30 seconds. Remove with slotted spoon and place on cookie sheet with parchment paper. Top with a sprinkle of coarse salt and bake for 20 minutes or until golden brown. Serve warm & enjoy!