"Boiled food retains CQ10, while food prepared by frying may lose some of its CQ10."
http://www.livestrong.com/article/545390-nutrients-that-create-cq10/"...frying vegetables reduces CoQ10 by approximately 14 to 32 percent, the vegetable's CoQ10 content did not change when boiled...
Although the amount of CoQ10 obtainable from food seems small, research indicates that the body's ability to create CoQ10 combined with a healthy diet ensures that most people do not have a deficiency."
http://www.livestrong.com/article/256149-what-foods-are-rich-in-coq10/"Beef has the highest amount of coQ10 of any food source. A 3-ounce serving of fried beef has 2.6 milligrams of coQ10, according to a study in the 1986 International Journal for Vitamin and Nutrition Research. The liver, muscle and heart of the cow have the greatest amounts."
http://www.livestrong.com/article/326159-foods-that-are-high-in-coq10/ "CoQ10 is necessary for the production of energy in all of your cells, and its antioxidant effects are important to protecting your cells from free-radical damage... CoQ10 inhibits blood clot formation and can help treat heart disease, high blood pressure and high cholesterol. A deficiency of CoQ10 can manifest as high blood pressure, fatigue that is not relieved by adequate rest, periodontal disease and weight gain.
Your body is able to produce a small amount of CoQ10 on its own, and you generally obtain the rest from your diet. Meats are a high source of CoQ10. Beef liver and pork liver are rich in CoQ10. Beef, chicken and venison are high in CoQ10. There are 2.6 mg. of CoQ10 in 3 oz. of beef and 1.4 mg. in 3 oz. of chicken.
Herring, mackerel and rainbow trout are healthy sources of CoQ10. There 2.3 mg of CoQ10 in herring, 1.2 mg in mackerel and 0.9 in rainbow trout.
Spinach and broccoli represent healthy vegetable sources of CoQ10, along with cauliflower. One ounce of sesame seeds contains 0.7 mg of CoQ10, while pistachio nuts contain 0.6 mg. Soybean oil and canola oil, both contain about 1 mg of CoQ10. One medium orange contains 0.3 mg of CoQ10, and 1 cup of strawberries has 0.2 mg.
http://www.livestrong.com/article/409792-what-foods-have-coenzyme-q10/I cannot find info. on the Co Q10 amount in beef liver/heart.