1. Combine chopped apples, granulated sugar, and vanilla powder in a large pot, mixing until everything is well incorporated.

2. Add cold water and lemon juice to the pot, then bring the mixture to a boil over high heat - that's 232°C or 450°F if you're using a thermometer.

3. Reduce the heat to medium-low, about 160°C or 320°F, and let the mixture simmer for 20-25 minutes. You're aiming for tender apples and a liquid that has thickened into a syrupy consistency.

4. Remove the pot from the heat and let the apple compote cool down to room temperature, around 20°C or 68°F.

5. Use the compote straight away or store it in an airtight container in the fridge, where it'll keep for up to 5 days. Alternatively, you can freeze it for up to 3 months.