- Blend the tomatoes with 1/4 of the peeled onion until you have a fine pulp.
- Strain the pulp through a conical strainer and into a large bowl.
- Lightly fold in the mayonnaise, sour cream, heavy cream and tomato puree into the sieved tomato pulp.
- Then add a pinch of salt and pepper and the finely chopped dill and fold into the mix.
- Add the gelatin to a small pan and “sponge” with the juice from half of the lemon.
- Melt the gelatin over a low heat until it dissolves and then pour it onto the tomato mix, stirring it into the mix as you pour.
- Test the mix for seasoning and add salt and pepper to taste.
- Pour the mixture into individual ramekins, molds or mini-savarin rings and refrigerate for at least 1 hour.
- Just before serving, run a small knife around the edge of the mold and turn out the mousse onto a plate.
- Decorate the mousse with the split lobster tails tossed in the olive oil, remaining lemon juice and chopped chives on a bed of watercress.
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