To begin with Biryani, Pakistani and Indian Shia eat biryani but Iranian Shias might not like too much spices as I know, they eat less spices and Biryani is Spice-Heaven.
1. Now to the rest of questions; there are plenty of similarities between Shias and Sunnis, both Shias and Sunnis believe in Prophet (PBUHHP) as last Prophet and love his Ahlebait and companions. However, there is a major difference of as to who is the worthy successor of Prophet (PBUHHP). We Shias have plenty of evidence from Qur'an, Hadith and History that proves that Imam Ali (عليه السلام) should have been paid allegi