1. Soak lentils and peas overnight.
2. Drain lentils and peas and put into a saucepan.
3. Add cold water, bring to a boil and boil 10 minutes.
4. Add vegetables and garlic, cover and cook gently 10 minutes.
5. meanwhile, melt ghee in a saucepan.
6. Add turmeric, mustard seeds and garam masala and cook gently 2 minutes or until seeds begin to pop. Stiri into lentil mixture and cook 15 minutes or until vegetables and lentils are tender and liquid has been absorbed.
7. Seasoni with salt.
8. Garnishi with celery leaves and lemon slices and serve hot.