The process of preserving food in a hermetically-sealed jar or tin was the answer to a problem proposed by the French and English governments as their armies subsided on salted meat and hardtack perishable food was great.
Being rich in fibre and one of the best plant-based proteins makes peas a satisfying component of a meal. They are also a useful vegan source of iron, which is needed for making red blood cells and transporting oxygen around the body.
Widely recognized as one of the healthiest snacks available, celery is a wonderful source of fiber. Its fiber content is especially impressive given the vegetable's low calorie count.
Onions are botanically part of the lily (Liliaceae) family, along with garlic, shallots and leeks. Although not valued as highly as garlic, onions contain potent compounds which are known to benefit health