The French name tells you all; it means ‘eat it all’. Mangetout properly means a type of garden pea picked very young, so young that the pod is still flat and the peas have barely developed.
Typical values per 100g (cooked): energy 33 kcal, 139 kJ; protein 3.6g; carbohydrate 4.2g; fat 0.2g.
Best eaten quickly. The ideal to keep them crisp and fresh is to store in the refrigerator in a roomy plastic bag or box into which you have sprinkled a little water, which will then keep them in very good condition for days.