There's a simple system for identifying the meal. Soups, main courses and desserts each have their own box shape and pattern, while color works for ingredients: pink is for fish and seafood, green is for vegan meals and yellow for the rest (meat, chicken, etc.).
Desserts have their own color coding which depends on nuts, berries and lactose free products. And there are always respective icons on the lid to tell you everything in details: from ingredients to calories and cooking time.