Flank Steak with Radicchio and Plum Salad

INGREDIENTS

• 1 lb. trimmed flank steak
• Kosher salt, to taste
• 2 cups red wine
• 2 Tbs. red wine vinegar
• 2 Tbs. extra-virgin olive oil
• 1 large head radicchio, sliced into 1/2-inch-wide strips
• 3 plums (just underripe is best), cut in half, pitted and thinly
• sliced
• Leaves from 1/2 bunch fresh flat-leaf parsley
• Freshly grated nutmeg, to taste