Egg salad sandwich with onions has egg, onions and spices/seasonings/dressing, etc., as its ingredients. All these materials originate from plants and animals (which utilizes plant products as their food). Thus, all these ingredients of the food are plant products. Plants (containing chlorophyll) uses the process of photosynthesis to convert solar energy into food, according to the following chemical reaction:
`6 CO_2 + 6 H_2O + sunlight -> C_6H_12O_6 + 6 O_2`
In this process, plants use carbon dioxide and water, in the presence of sunlight and generate glucose and oxygen. The glucose molecules are then used for energy production (by cellular respiration) and plant growth. We consume plant products directly or utilize animal products, which were obtained as a result of consumption of plants. For example, bread is made from flour, which is prepared from wheat or some other cereals. Onions are obtained directly from onion plant. Eggs are obtained from chicken, which consume plant products as food. Thus, the food mentioned here is obtained from plants.
Hope this helps.
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