Mix all marinade ingredients in a bowl. Coat the steaks thoroughly and refrigerate for at least 30 minutes or overnight. Let steaks sit at room temperature for 30 minutes before cooking
Preheat oven to 375°F.
Preheat cast-iron skillet or grill pan on medium-high heat.
Sear Top Round London Broils on all 6 sides, for 1-2 minutes per side. Transfer to sheet pan and finish in oven. Roast for 5-8 minutes, or until thermometer inserted in thickest part reads 120°F. Let rest for at least 8 min before slicing.
Preheat non-stick sauté pan to medium heat, and add olive oil. Once oil is hot, add garlic. When garlic begins to brown, add squash noodles and tomatoes and sauté for 3-5 minutes, or until noodles have softened.
Add lemon juice, chili flakes, parsley and salt and pepper. Continue to sauté until mixed. Serve with sliced steak and enjoy!