Home made Swiss Roll

Ingredient :

• 4 egg whitle + 50 gm of caster sugar
• 4 egg yolk    + 50 gm of caster sugar
• Cooking oil - 50 gm
• Plain flour - 100gm
• Baking powder - 1/2 tsp
• Water 50 gm
•  Cream of tartar 1/2 tsp