"Bongu" powder, also known as toasted milk powder, is essentially powdered milk that has been heated to a specific temperature, resulting in a rich, nutty, and slightly caramel-like flavor. It's a versatile ingredient that can add depth and complexity to both sweet and savory dishes. 
Here's a more detailed breakdown:
Flavor:
Toasting milk powder transforms its taste from plain milk powder to one reminiscent of caramel or hazelnuts. The intensity of the flavor depends on the degree of toasting. 
Appearance:
Toasted milk powder typically has a golden or brownish hue. 
Production:
It's created by heating powdered milk, often skim milk powder or whole milk powder, until it develops the desired color and flavor. 
Usage:
Toasted milk powder can be used in a variety of applications, including:
Baking: Adds a unique flavor and color to cakes, brioche, biscuits, and pastries. 
Sauces and Soups: Can be used to add richness and depth to creamy sauces and soups. 
Ice Cream: A great way to add a toasted milk flavor to homemade ice cream. 
Benefits:
Beyond flavor, toasted milk powder can also enhance the texture and aroma of food products.