Roast the coriander seed and mustard seed in a pan without fat, remove. Wash and finely chop the chilli and coriander root. Peel galangal, garlic, ginger and shallot and cut into cubes.
Halve lemon grass lengthwise and cut finely. Put them together in a mortar and mortar, fill into a bowl. Stir in turmeric, shrimp paste and 2-3 tablespoons of peanut oil. Wash lime leaves and coriander leaves, pluck coriander leaves.
Finely chop the leaves and stir into the spice mixture. Wash duck breasts, dab dry. Carve the skin finely. Season with salt and rub with some spice mixture. Heat a flat roaster or an ovenproof pan without fat.
Fry the duck breasts only on the skin side for about 3 minutes. Then fry on the meat side for 2-3 minutes. Roast duck breasts in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 12-15 minutes.
Sort the spinach and wash in plenty of water. Cut the tofu into cubes. Remove the duck breasts. Wrap in aluminium foil and let it rest. Heat 2 tablespoons of oil. Fry the tofu for about 5 minutes until crispy, turning carefully.
Season with salt. After 3 minutes add sesame, nuts and the remaining spice mixture. Remove from the pan. Add spinach to the pan. With closed lid and steam for about 5 minutes. Cut meat into slices.
Fold the meat and tofu mixture into the spinach and arrange in bowls.