Cook buckwheat/quinoa/brown rice according to the instructions on the package. This will take about 15-30 minutes.
Roast mustard, cumin, fennel, and coriander seeds in a dry pan until fragrant and lightly browned. Crush in pestle and mortar. Optional, add cardamom if you like.
In a large pot, heat cooking oil over medium heat. Saute onion for 2-3 minutes, then add garlic, ginger, turmeric and roasted, crushed herbs. Cook, while stirring, for 1 minute more.
Add carrots, tomatoes, and eggplant. Cook for 5 minutes. Stir regularly.
Add snow peas and coconut milk. Cook for 5 minutes.
Season with salt, black pepper and squeeze of lime
Add fish and simmer on low until the fish is cooked through.
Serve with buckwheat and chopped parsley.