Sunny Pawar, in case you have not yet seen this movie, is “Lion”’s secret weapon. Pint-sized and precocious, Pawar, now eight, was six when he inhabited the role of Saroo as a young boy separated from his mother in a remote area of India. When he began his acting career starring in this movie, he did not know English, but this week at a special screening of the film and dinner at The Monkey Bar, he was happy to talk about “Lion,” how director Garth Davis cast him, selecting from 2000 boys, and his next movie, “Love, Sonia” co-starring Demi Moore. In short, and no pun intended, he’s a natural with a big career ahead of him. I can still hear his whiskey voice.