Peel and finely dice the shallot. Drain the soup paste in a saucepan, sauté the shallot in it until transparent, dust with flour and sauté. Deglaze with stock, 1/4 liter water and cream.
Bring to the boil while stirring and season to taste with salt, pepper and cognac. Add shrimps to the soup, bring to the boil again briefly and serve garnished with cream and dill.