Fry the tomato and garlic in olive oil in the large paellera (special paella pan), then add the rice, stir for a minute and then add the chicken, chicken stock (there should be 6 glasses), artichokes, red peppers, the juice of half a lemon, black pepper, parsley, thyme, rosemary, the saffrón strands (grind them first. If you haven't got a grinder, use Colorante which you'll find in the spice and herbs racks in supermarkets) and salt.