Your dishes
Use sales from a recent period, such as the last month. You need at least 4 dishes. Food cost is what the plate costs you, and prices should exclude GST.
What the four groups mean
Star
Popular and profitable. Protect them and feature them.
Plowhorse
Popular but thin margin. Review price, portion or cost.
Puzzle
Profitable but few order it. Rename, reposition or recommend it.
Dog
Low sales and low margin. Rework it or consider removing it.
This follows the classic menu engineering method: a dish counts as popular if it sells at least 70% of an equal share of orders, and as profitable if its margin per plate beats the menu's average. Results are only as good as your numbers, so use it as a first look, not a final verdict.
Want me to review the numbers?
Send your result and I'll look at it with you on a free call. Name, phone and email are needed so I can reach you.