You have to admire the Indian obsession with snacks. Snacking in this country is an art form from samosas through to the more elaborate chaat featuring all types of fabulous spices and textures. But I found perhaps my favorite snack so far – and it’s a meal unto itself. Behold – the Bombay Vegetable Sandwich. Yes.. a sandwich – bread, tomatoes, cucumber, crushed potatoes (usually cooked with spices) and finally – cheese. Gourmet this is not. Hearty and comforting, that it is. Yes, it’s a toasted sandwich. Potatoes are boiled well in advance, and peeled prior to assembly and sometimes mashed with spices. The tomatoes, cucumbers, potatoes and other ingredient…