Beef with stalks

2 lbs fat-trimmed boned beef chuck , rinsed and cut into 3/4-inch chunks 1 onion , peeled and chopped (8 oz.) 2 garlic cloves , peeled and minced 1 -2[...]

6 -8 ounces roast beef , rare and sliced (quality matters here, for this dish I go for rare, sliced RB from Whole Foods) 1 cup greens (field greens, about two[...]