1 Pain that does not diminish with rest, and pain that may be worse at night than during the day. 2  Back pain along with constitutional symptoms, such as loss of appetite, unplanned weight loss, nausea, vomiting, or fever, chills or shakes.
Unstable chemicals. Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion.
2 Spread the very finely minced onions out on baking sheets. Place in the oven and Scrape and loosen the onion bits several times as they are drying. (Humidity and the amount of moisture in the onions is what will determine how long it takes them to dry, so I am not giving a time... other than hours).