Combine and mix water, yeast and 2 teaspoons sugar and cover for 10 minutes to let the yeast activate
Add flour and salt and mix till combined
Drizzle with oil and cover for 60 minutes to rise
Wet hands and stretch and fold the dough on top of itself about 5 times
Cover again for 60 minutes to rise
Add frozen raspberries, lemon juice, ½ cup white sugar and 1 tablespoon vanilla extract to a pan and cook till all combined
Line a 12x12 inch baking tray with baking paper and drizzle oil on the sides
Add dough and stretch to cover the whole tray
Spread custard and raspberry mixture on the dough as desired
Stretch and fold the dough and cover to rise until it fills out the pan (about 30 minutes)
Drizzle oil on top and dimple in the dough
Add remaining custard and raspberry mixture on top
Bake in the oven at 200 degrees Celsius (400 Fahrenheit) for 35-40 minutes or until golden brown
Place on cooling rack once out of the oven
Once cooled, dust with icing sugar and enjoy
