Beef, watercress, and peach salad with lime vinaigrette

I love recipes from "Real Simple".  Here's one I tried last week. It's definitely a keeper!

 Hands on time:25 min total time:25 min serves 4-6

2 bunches watercress, thick stems removed

2 kirby cucumbers roughly chopped

4 ripe peaches cut into wedges

1 1 pound piece roast beef, cubed

1/4 cup fresh lime juice

1 1/2 teaspoons sugar

Kosher salt and pepper

1 small clove garlic finely chopped

2 teaasoons finely grated ginger

1/2 cup extra virgin olive oil

2 large shallots thinly sliced

In a large bowl, combine the watercress, cucumbers, peaches, and beef.  Pour the lime juice into a small bowl and whisk in the sugar and 1/2 teaspoon salt until dissolved.  Add the garlic, ginger, and 1/4 teaspoon pepper. Slowly add the oil in a steady stream whisking constantly until emulsified.  Stir in the shallots.  Transfer the salad into a serving bowl or platter and drizzle the vinaigrette over the top.

Tip: for cooked roast beef, look no further than the deli counter.  Ask the server to forgo the slicer and cut a 1 pound slab by hand