Yes! The yolks have nutrition and energy for you.
yolks - like egg yolks
Egg yolks contain seven vitamins: B6, folate, B-12, A, D, E and K. Of those, vitamins A, D, E and K are found only in egg yolks and not in egg whites. Egg yolks are one of only a handful of foods in which vitamin D is naturally found. Egg yolks also have minerals: calcium, magnesium, iron, potassium, sodium and selenium. Although both the egg white and egg yolk contain these minerals, the yolk has larger amounts of most. For example, 90 percent of an egg's calcium is in its yolk; 93 percent of its iron content is in the yolk, with just 7 percent in the white.
Saturated fat. Egg yolks are also high in cholesterol and essential fatty acids, and when consumer in small amounts can be healthy.
Nothing, I'm afraid. Egg yolks are very niche in their properties, as such they have no good substitutes.
It is a richer custard if you use just yolks. But you can use more yolks than whites and it will still be yummy.
The chances of finding twin egg yolks in a single egg are rare, occurring in about 1 in every 1,000 eggs.
To cure egg yolks effectively, mix salt and sugar together, then create a bed of the mixture in a container. Make small wells in the mixture and carefully place the egg yolks in them. Cover the yolks with more of the mixture and let them cure in the refrigerator for a few days. Rinse off the mixture before using the cured egg yolks in dishes.
Egg yolks and oil. Usually a little vinegar or lemon juice is also added for flavor.
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Yema is Spanish for egg yolks, but it also is the name for a traditional Spanish confection made from egg yolks and sugar. They are very popular in parts of Spain and sometimes are referred to in the U.S. as candied egg yolks.