Japanese Sweet Potato (Dessert)

Bahan-bahan (5 porsi)

• 3 Japanese sweet potatoes
• 2 Tbsp unsalted butter
• 5 Tbsp sugar ((to keep the sweet potatoes natural yellow color, use granulated sugar instead of other sugars such as brown sugar))
• 2 large egg yolks
• ⅓ cup heavy (whipping) cream
• ½ tsp pure vanilla extract
• 1 large egg yolk ((the egg yolk acts as a binder as well as additional rich yellow color and custardy taste))
• ½ tsp toasted black sesame seeds