Preheat oven to 450°. Combine grapes, 2 teaspoons olive oil, and vinegar on a foil-lined baking sheet. Bake at 450° for 10 minutes; let stand 5 minutes. Place grapes, walnuts, lemon juice, 1 teaspoon olive oil, salt, pepper, and arugula in a large bowl; toss. Sprinkle with crumbled feta cheese.
My family does not like arugula so I used some mixed salad greens. The warm roasted grapes wilted the lettuce a bit and hubby did not like that. Next time I'll just stick with spinach (always good a bit wilted). Nice flavors. I would definitely double the dressing next time too. Pecans or almonds might make a nice change in this too.
There must have been something wrong with jmeleeS's grapes. I've made this a few times and the grapes are sweet and delicious, they contrast beautifully with the walnuts, salty feta and slightly bitter arugula. Totally worth the extra step of roasting them.
Yuck - sorry, but this was not a winner. My grapes ended up tasting medicinal and the lemon just made it worse. Arugula, toasted walnuts, feta and the dressing; yes it's good. Add the grapes and it became a flavor profile that didn't mesh well for me. A little involved for a "quick" salad, combined with the flavor - wouldn't make again.