Preheat oven to 170°C for the raw peanuts. Spread peanuts in single layer on baking tray, bake at 170°C for 20-22 minutes, or until golden brown. Set aside to cool after removing from oven.
Process the roasted peanuts into finely ground peanut using a food processor.
Combine plain flour, icing sugar and salt, then sieve into ground peanut, mix well. Add in peanut oil and mix until a dough is formed.
Preheat oven again to 170°C for the cookies.
Take out ½ tablespoon (about 7 g) of dough, press until firm and shape gently into a ball. Place the dough balls slightly apart on a lined baking tray.
Lightly press the dough balls with funnel stem to create small circles.
Prepare the egg yolk wash: Mix together water and egg yolk, then strain through a sieve.
Brush the top of dough balls with some egg yolk wash.
Bake in the preheated oven at 170°C for 20 minutes. After removing from oven, set aside to cool completely.
When completely cooled, transfer to airtight containers for storage.
Video
Notes
This recipe yields about 120 pieces of cookies. The nutritional value for reference is for 1 cookie.