Preheat oven to 450°F with rack in middle.
Trim beets, discarding stems and greens (or reserve for another use), then wrap together in foil and roast until tender, about 1 1/4 hours. Let beets stand in foil at least 15 minutes, then remove from foil and cool. Remove skins and cut beets into 1/3-inch dice.
Whisk together shallots, vinegar, lemon juice, sugar, 1/2 teaspoon salt, and 1/4 teaspoon pepper, then whisk in oil. Reserve 2 tablespoon vinaigrette for watercress and toss remainder with beets. Let marinate at room temperature 30 minutes.
To serve: Drain beets in a sieve set over a bowl and set beet vinaigrette aside.
Put pastry ring in center of a salad plate and gently press about 2 1/2 tablespoons fish into bottom of ring, then put about 1/4 cup beets over fish. Repeat on 7 more plates.
Toss watercress with reserved 2 tablespoons vinaigrette and mound over beets (a small handful per plate). Drizzle a little beet vinaigrette around each plate.
Cooks' notes: Beets can be roasted and tossed with vinaigrette 1 day ahead, then chilled. Chill reserved vinaigrette separately. Let stand at room temperature 30 minutes before serving. Watercress sprigs can be prepared (but not tossed with vinaigrette) 1 day ahead and chilled, wrapped in dampened paper towels in a large sealable bag.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	183.23 Kcal (767 kJ)
Calories from fat	117.56 Kcal
		% Daily Value*
Total Fat	13.06g	20%
Cholesterol	18.14mg	6%
Sodium	286.77mg	12%
Potassium	517.12mg	11%
Total Carbs	10.02g	3%
Sugars	6.57g	26%
Dietary Fiber	2.96g	12%
Protein	7.46g	15%
Vitamin C	17.5mg	29%
Iron	1.5mg	8%
Calcium	60.7mg	6%

Amount Per 100 g
Calories	114.64 Kcal (480 kJ)
Calories from fat	73.55 Kcal
		% Daily Value*
Total Fat	8.17g	20%
Cholesterol	11.35mg	6%
Sodium	179.42mg	12%
Potassium	323.54mg	11%
Total Carbs	6.27g	3%
Sugars	4.11g	26%
Dietary Fiber	1.85g	12%
Protein	4.67g	15%
Vitamin C	11mg	29%
Iron	0.9mg	8%
Calcium	38mg	6%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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