1. Slice the apple into 8 pieces.

2. Place the apple slices, sugar and lemon juice in a microwave-safe bowl (3 liter or 3 quart).

3. Cover with a vented microwave lid and cook on HIGH (1200W) for 2 minutes.

4. Take out and let it cool. The jam will thicken as it cools.

* When using plastic wrap as a cover, poke a hole in the center to release the steam.

For how long you should cook with your microwave oven, see Cooking Time vs Wattage Conversion.
For more tips of using Microwave Oven, see Sachiko's Guideline to Microwave Cooking.