Mix the sugar and yeast with 250ml warm water and leave until the mixture starts to froth a little. Put the flour in a large bowl with a large pinch of salt and add 2 tbsp oil and the yeast mixture. Mix to a rough dough with a wooden spoon and then tip onto a floured surface and knead until you have a smooth, soft dough. Knead in more flour if you need to. Tip into an oiled bowl, turning the dough until it is coated in oil, cover and leave to rise until doubled in size. Punch the air out of the risen dough.