Poached Salmon without mango tomatoes snap

1/4 cup chopped onion 1/4 cup chopped celery 1 tablespoon chopped shallot 1 quart water 1/2 cup dry white wine 2 tablespoons white vinegar 2 slices lemons 2[...]

1 lemon , ends trimmed, sliced into rounds 2 tablespoons parsley , chopped, stems reserved 2 tablespoons tarragon , chopped, stems reserved 1 large shallot ,[...]