Rich Coffee Custard

This is my mother's recipe which I think she got from her mother... As children growing up in Europe, we used to be given rich milk puddings to build up our strength or to make us feel better if we were sick. This is a more grown up version.
Ingredients
2 cups milk
1 cup whipping cream
3 whole eggs and 3 egg yolks
3/4 cup sugar
1 cup strong coffee
2 tsp. instant coffee granules
Method
Preheat oven to 300 degrees. Mix milk & cream in a large bowl. Strain whole eggs and yolks into mixture thro' a strainer. Stir in sugar, coffee, and instant coffee. Butter 6 ramekins and arrange in large baking dish. Pour hot water (not boiling) around ramekins til halfway up sides. Bake custard 50-60 mins. A knife inserted will come out clean (middle will be slightly runny). Leave ramekins in water for few more mins. May serve warm or cold, garnished with whipped cream and chocolate covered coffee beans.