The subtle fragrance and natural sweetness of the sake lees enhances the milky flavor of this toast. I recommend it if you like sake lees.
I tried using amino-acid rich sake lees on toast, and I liked it lot. I tried using skim milk, honey, and many other things, but the milky flavor of condensed milk went best with the sake lees.
Sake lees loses flavor when heated, so I recommend using it as a topping after toasting the bread. It will taste sweeter that way too. Adjust the amount of ingredients to taste.
Enjoy Japanese food around the world.