Preheat the oven to 425 degrees F. Place a pizza stone or a large baking tray in the oven to heat up. Heat the milk in a small pan over a low heat until lukewarm, then place 50 ml into a bowl with the yeast and sugar. Mix well, then set aside for a few minutes until starting to bubble.
Meanwhile, sift the flour, xanthin gum and salt into a large bowl, then make a well in the middle. In a separate bowl, combine the egg, 3 tablespoons of olive oil and the remaining milk, then pour it into the well, along with the yeast mixture. Gradually bring the mixture together with a fork until it forms a smooth dough.
In a small cup, combine the soda and vinegar, then quickly knead it into the mixture. Place the dough into a lightly oiled bowl, cover with a damp tea towel, then leave to rise in a warm place for around 1 hour, or until doubled in size. Divide the dough into four pieces and form each piece into a smooth ball. Cover with a clean tea towel and let rest for about 30 minutes before rolling out into a pizza round. Place the rolled out pizza round onto a pizza pan and press into the pan using fingertips. Pre-cook the pizza dough for about 10 minutes before adding toppings.