How to make this delicious strawberry dessert

INGREDIENTS:

• 3 tablespoons of sugar
• 3 tablespoons of corn starch
• vanillin
• 500 ml of milk
Put in the fridge for 3 hours.

For the sauce:
• 200g of strawberries
• 3 tablespoons of sugar
• 50 ml of water
• 2 tablespoons of corn starch