1 large radicchio, quartered
½ cup extra-virgin olive oil, divided
Kosher salt
Freshly-ground black pepper
2 Tbsp red wine vinegar
1 tsp Dijon mustard
2 Tbsp rendered bacon fat
4 slices cooked bacon, crumbled
Toss radicchio with ¼ cup olive oil. Sprinkle liberally with kosher salt and freshly-ground black pepper.
Place on a medium grill and cook until marked on all sides and heated through.
Meanwhile, whisk together vinegar and mustard. In another bowl, combine remaining olive oil and bacon fat. Slowly stream oil mixture into vinegar mixture while whisking continuously.
Drizzle dressing over radicchio and sprinkle with bacon. Serve warm.