The best cos leaves to eat are the inner “heart” leaves – they are sweeter and lighter in colour.
Once the leaves are removed give them a quick rinse under the tap and dry, preferably in a salad spinner to avoid breaking the leaves if you are making a salad with whole leaves.
Cos lettuce can also be roughly sliced sideways into small rectangular pieces and placed in a bowl with your favourite salad ingredients.
Buying and storage
Look for big dark green leaves on the outside without any brown spots or slimy edges. The lettuce should have a nice full heart with good weight. Make sure the outside leaves are still crisp. Cos will generally store for longer with the outside leaves left on. Store in a plastic container in the crisper section of your refrigerator and remove the outer leaves before use.
Since cos is an already sweet lettuce, it works best in a salad with a light lemon based dressing or a thin mayonnaise dressing if used in a Caesar salad. Cos is great as a base decoration on a food platter to add a touch of green to the presentation. For a quick and easy snack try the combination of a square of cos lettuce, with a slice of apple and cheese.
vitamin A (provitamin beta-carotene),