Prasadam is MERCY in Sanskrit. Before eating food, we offer it to Lord Krishna. When we eat this kind of offering food which is PRASADAM, we receive the mercy of the Supreme Personality of Godhead. Offering food to Sri Krishna and take the prasadam is a spiritual activity.
Prasadam is an extraordinary food. When we are offering our foods to Sri Krishna, we speak of honouring prasadam. Honoring prasadam helps us to develop love of Sri Krishna. So by eating prasadam we make advancement in spiritual life.
When we take our prasadam we should practice doing. So, if we are in a prayerful mood its better. Honouring prasadam means to treat the prasadam.
We must remember that to take prasadam is extraordinary. It is the perfection of eating. Prasadam is transcendental to mundane reality. When eating we should consider the spiritual value of the food we take. Sri Krishna has accepted it and it has become spiritually identical to Him. In this way, by eating prasadam, we  become purified. Our conciousness and our cells  will full with Sri Krishna’s love. So Prasadam is a transcendental food.
Preparing, offering and eating prasadam is DEVOTIONAL SERVICE or BHAKTI YOGA…