Kiln theatre, London A familiar romcom isn't an option for these two young British Muslims, who can't shut out Islamophobia and public paranoia from their love story The title? It's a sandwich filling. In Suhaiymah Manzoor-Khan's first full-length play, boy woos girl with his signature sarnie: a blend of sweet and crunchy that suits this arrestingly unexpected romance. They meet at uni in London. Hafsah from Bradford…