In a deep bowl, whisk the eggs and yogurt. Add the stick of butter and vanilla and continue whisking. Add the sugar and whisk for 3 more minutes.
In another deep bowl, whisk together the flour, cocoa, baking powder, and baking soda. Add the salt.
Add the dry ingredient mixture to the wet ingredient mixture and whisk for 3 minutes. Add the water and whisk for 2 more minutes.
Pour the mixture into 2 greased rectangular cake pans and bake for 25 minutes until the cake is well done.
Make the frosting while the cake is baking:
Melt 1/2 stick of butter in the microwave.
In a saucepan, mix the condensed milk, butter, cocoa powder, and cocoa powder. Cook over medium heat.
With a wooden spoon, stir continuously while the sweet cooks. It should cook until it thickens, approximately 20-30 minutes. One way to know it's ready is if you can see the bottom of the pot when you move it.
Remove from heat.
Cut the cake into hearts with a heart-shaped cookie cutter and cover with the chocolate frosting while it is still slightly warm.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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