01 - Preheat oven to 400°F for roasting garlic and finishing steak.
02 - Slice tops off garlic bulbs to expose cloves. Drizzle with 1 tbsp olive oil, wrap in foil, and roast for 30 minutes until soft and golden.
03 - Pat flank steak dry and rub with 1 tbsp olive oil, salt, and pepper evenly.
04 - Heat ovenproof skillet over medium-high heat. Sear steak 3-4 minutes per side until well browned.
05 - Transfer skillet to oven and roast 6-8 minutes for medium-rare, adjusting for desired doneness.
06 - Remove from oven, transfer to plate, tent with foil, and let rest 10 minutes.
07 - Squeeze roasted garlic cloves into saucepan. Add broth, bring to simmer over medium heat while whisking to break up garlic.
08 - Add cream, butter, Dijon mustard, and lemon juice. Simmer 2-3 minutes while whisking until smooth and slightly thickened. Season to taste.
09 - Slice flank steak thinly across the grain. Spoon roasted garlic sauce over steak and garnish with fresh parsley.