Remove the core of the apples and chop them into small pieces
Heat the water, sugar, and lemon in a saucepan till the sugar has dissolved
Add the apples to the pot and let boil at medium heat till the apple is tender
Remove from heat and blend tills it has an even texture
Let the apple-mixture cool in the fridge (make the cheese-layer while it cools)
When the apples have cooled:
Let the isinglass soak in cold water for 5-10 minuts till it is soft
Remove the isinglass from the water and press any leftover water out of the isinglass and put it in a metal-bowl
Melt the isinglass in a water bath with boiling water
Remove the isinglass from the heat and add a couple of tablespoons of apple to the isinglass - stir till it has an even texture
Add half of the apples to the isinglass a couple of tablespoons at a time, stirring constantly
Add the rest of the applemixture and stirr till it has an even texture