Toss the mesclun, or your choice of salad greens in a bowl with the juice of one lemon, plus the vinaigrette. Divide equally onto plates, mounding the greens in the center. Divide the salmon and trout fillets evenly among the plates, arranging them around the greens. Sprinkle the capers and onion around the fish. Drizzle one teaspoon of chili oil over the fish on each plate.
Artfully arrange a dollop of sour cream on each plate and top the sour cream with caviar.
Dust the plate with some chopped fresh chives and serve with country-style pumpernickel bread.
In the bowl of a food processor fitted with a sharp blade, process the vinegar, mustard, honey, shallots, salt and pepper until the shallots are finely chopped. With the processor running, add the oil in a small stream until all the oil has been incorporated and the dressing has achieved a silky, smooth texture. The dressing may be stored, covered, for up to one week in the refrigerator, but should be brought to room temperature before using. Yield: 1 cup;