1. Using gloves, carefully pick the flowering top of approximately 10 nettles and wash.
2. Peel and cut the potato into thin slices. Wash and slice the zucchinis.
3. In a casserole dish, add 3 tablespoons of olive oil, brown the sliced onion, potato slices, zucchinis, garlic clove and stemless nettles for 5 minutes.
4. Cover with water, 2 bags of dashi and cook on medium heat for 30 minutes.
5. Remove the two bags of dashi and blend.
6. Add heavy cream and shichimi spices.
Add salt to taste if needed.