Parsnip and Lentil Soup

I found a recipe for Parsnip, Potato and Lentil Soup over at vegan eating for one. I changed some of the ingredients and came up with my version. TS ate it quite slowly so I didn't ask him if I should keep the recipe because I liked it and want to make it again but he didn't seem to enjoy it too much. I think it might have been the spices because I haven't used turmeric and cumin together before. Actually I haven't used them very much at all.

Parsnip and Lentil Soup
1 celery stalk
1 medium carrot
1 medium – large parsnip
4 – 5 medium potatoes
2 dl brown lentils, well rinsed
1 litre water
¼ tsp each cinnamon and oregano
½ tsp each cumin, turmeric and parsley
1 tsp each olive oil and soy sauce
salt and pepper to taste
½ tsp lemon juice

Peel (except celery) and dice all of the vegetables. Place vegetables in cold water and bring to a boil. Add lentils, oil and spices and reduce heat to a simmer. When lentils and potatoes are cooked, add lemon juice and serve.