Russian Piroshki (pirojki) with apples - Пирожки

Bahan-bahan (15 porsi)

• 1 1/2 Tbsp oil
• 15 oz luke warm water
• 4 cups + 2 Tbsp all-purpose flour (divided)
• 1 tsp salt
• 1 Tbsp Active Dry Yeast
• 1 Tbsp sugar (omit sugar if doing meat or potato filling)
• 2 to 3 apples (peeled, cored and chopped finely (I use a food processor and pulse several times))
• 1/4 cup sugar (1/4 teaspoon per piroshok)
• Enough canola oil to go half-way up the side of the piroshky when frying.
• Extra flour to dust the cutting board.