Prepare beef: Preheat oven to 425°F.
Stir together mustards, brown sugar, pepper, and lemon zest.
Pat beef dry and season generously with salt. Heat oil in a heavy skillet over moderately high heat until just beginning to smoke, then brown beef on all sides, about 2 minutes total.
Transfer to an oiled shallow baking pan and coat with mustard mixture.
Roast beef in middle of oven until a thermometer inserted 2 inches into thickest part of meat registers 125°F for medium-rare, 15 to 20 minutes. Transfer to a cutting board and let stand until cool, at least 45 minutes.
Prepare salad while beef is roasting: Chill onion slices in water to cover 30 minutes. Cook beans in boiling salted water until crisp-tender, about 5 minutes. Drain beans in a colander and rinse under cold water to stop cooking, then transfer to a large bowl. Add arugula to beans. Drain onion slices and pat dry.
Make dressing and toss salad: Whisk together vinegar, lemon juice, mustard, and salt and pepper to taste. Add oil in a slow stream, whisking until emulsified.
Cut beef into thin slices.
Add onion slices, beef, and enough dressing to arugula and beans to just coat and toss to combine well.
Cooks' note: ·Salad components may be prepared 1 day ahead and chilled, separately.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	1207.66 Kcal (5056 kJ)
Calories from fat	851.86 Kcal
		% Daily Value*
Total Fat	94.65g	146%
Cholesterol	192.74mg	64%
Sodium	841.95mg	35%
Potassium	1501.39mg	32%
Total Carbs	23.33g	8%
Sugars	11.55g	46%
Dietary Fiber	6.08g	24%
Protein	59.61g	119%
Vitamin C	25.1mg	42%
Iron	7.5mg	42%
Calcium	173.7mg	17%

Amount Per 100 g
Calories	237.32 Kcal (994 kJ)
Calories from fat	167.4 Kcal
		% Daily Value*
Total Fat	18.6g	146%
Cholesterol	37.88mg	64%
Sodium	165.45mg	35%
Potassium	295.04mg	32%
Total Carbs	4.58g	8%
Sugars	2.27g	46%
Dietary Fiber	1.19g	24%
Protein	11.71g	119%
Vitamin C	4.9mg	42%
Iron	1.5mg	42%
Calcium	34.1mg	17%

* 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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