Wash the amaranth thoroughly in a sieve under running water and let it soak in gently boiling water for about 20 minutes. Then drain, rinse with cold water and drain well.
Wash and finely dice tomatoes. Peel the onions and cut into fine rings. Core the chilli pepper and chop very finely. Wash parsley, pat dry and chop very finely.
Mix the oil, sea buckthorn juice and lemon juice and season with salt and pepper.
Mix the amaranth with the prepared ingredients and the dressing and let it steep for another 30 minutes. Stir again, season to taste again if necessary and serve.