The last paragraph of Igros Moshe O.C. 2:40 discusses when you may order kosher food [such as a banana] in a non-kosher restaurant. R' Moshe Feinstein begins: ובדבר אם מותר לאכול ברעסטאראנט ...
Apparently the Ramchal wrote several plays. What are they about Where can I find full text (Ifound migdal oz here) - preferably translated Have gedolei yisroel discussed how to approach these ...