Mix sour cream and horseradish. Halve the lemon, squeeze 1 half. Cut the remaining half into slices. Peel and finely dice the shallot. Finely dice smoked salmon. Wash the dill, dab dry, pluck flags from the stalks except for a little bit for garnishing and chop finely.
Mix shallot, salmon, dill, olive oil and 1-2 teaspoons lemon juice, pour into espresso cups. Add horseradish dip and garnish with dill. Add lemon wedges.