I like the taste of beef bourguignonne and would like to create a vegetarian version of it. For that, I plan to use oven-dried, tempura-fried aubergine slices instead of meat (egg-containing tempura, fried to a golden crust), and mushroom stock for the sauce.
The problem is that I am not sure how filling this substitution will be, and how many calories it contains - the aubergines probably close to nothing, but the fried tempura is rich.
How should I go about calculating the portions, so they are roughly equivalent to a portion of standard beef bourguignonne?