Soak your green lentils in water for a couple of hours until they start to soften and swell.
Drain your lentils.
Bring 3 cupfuls of water to the boil and add your lentils.
Cover and simmer for around 30 minutes - check them occasionally as you want to keep them whole. They will start to break up if they become too soft.
Once cooked, drain them in a colander and pour cold water over them to cool them down and stop them cooking further.
When they have cooled, add your lentils to a serving bowl.
Now add the rest of your salad ingredients, except the tomatoes, and mix together gently.
Scatter your chopped tomato over the top.