Grilled beef sirloin roast is one of my go-to main dishes for family gatherings in summer. It’s elegant yet easy to prepare. After marinating overnight in balsamic vinegar, red wine, olive oil, and fresh herb stems, the roast becomes juicy, tender, and packed with flavor. We love serving it with Finnish new potatoes and two delicious sauces, a rich pan sauce and a fragrant basil oil.
A Highlight of Our Italian-Inspired Celebration
We made this dish recently for a family celebration with an Italian theme. The meal began with my Tomato-Basil Bruschetta and the refreshing Prosciutto, Mozzarella, Melon Salad. Both are light and flavorful starters that perfectly complement the richness of the beef.
As the sirloin roast grilled, the balsamic and herb marinade released incredible aromas. After cooking, we let it rest to ensure every slice would be juicy and tender.
To round out the meal, we served classic Finnish New Potatoes, perfect for soaking up the sauces. On the side, there were steamed green beans, grilled tomato halves seasoned with olive oil, salt, and pepper, and a savory mix of sautéed mushrooms and onions with fresh parsley. Each of these seasonal sides added color, texture, and balance to the plate.
Two Simple Sauces That Elevate the Grilled Beef Sirloin
While this roast is delicious on its own, the sauces truly take it to the next level.
To start, the first sauce is a rich pan sauce, made by simmering the leftover marinade with beef broth. Once strained, it transforms into a smooth, flavorful gravy that pairs wonderfully with both the beef and the potatoes.
The second is a vibrant basil oil, prepared simply with basil leaves and olive oil. It brings a fresh herbal lift to the dish. You can find the full basil oil recipe in my Prosciutto and Melon Salad post. These two sauces complement each other, so it’s definitely worth making both.
Tips for a Juicy, Flavorful Sirloin Roast
Here are a few tips for getting the most out of this recipe:
- Use only the parsley and basil stems in the marinade for a milder herbal note. Save the leaves for garnish.
- Before grilling, pat the roast dry. This helps you get that beautiful, caramelized crust.
- After grilling, let the roast rest for at least 30 minutes before slicing. This keeps it juicy.
We served our meal with a bottle of Chianti, which complemented the bold flavors beautifully.
To finish off the dinner, we had homemade pistachio ice cream with fresh strawberries. A refreshing and sweet end to a flavorful feast. That recipe is coming soon!
If you’re looking for a different cut and flavor, try this Grilled Beef Flank Steak with Marinated Vegetables recipe for a tasty twist.
Another delicious option to add to your grilling menu? Try my Grilled Eggplant Stuffed with Mozzarella and Tomato Sauce . It’s a satisfying and flavorful dish as a side to grilled beef sirloin.
Grilled Beef Sirloin with Balsamic Herb Marinade, Vegetables and Two Sauces
Ingredients
For the beef & marinade
- 1,4 kg about 3 lbs beef sirloin roast
- 3 tbsp balsamic vinegar
- 100 ml dry red wine
- 2 tbsp olive oil
- 2 tsp freshly ground black pepper
- 1 tsp salt
- a bunch of fresh parsley stems reserve leaves for serving
- a bunch of fresh basil stems reserve leaves for serving
The vegetables
- 300 g 10 oz green beans
- 6 ripe tomatoes halved
- Olive oil extra virgin
- salt and black pepper
For the mushroom-onion sauté
- 200 g 7 oz mushrooms, sliced
- 1 large onion thinly sliced
- 1 tbsp olive oil or butter
- 1 tbsp fresh parsley chopped
For the sauces
- Leftover marinade boiled and reduced
- 200 ml beef broth
Instructions
Marinate the beef
- In a bowl or zip-top bag, combine balsamic vinegar, red wine, olive oil, black pepper, salt, and chopped parsley and basil stems. Add the beef sirloin and coat well. Cover and refrigerate for 4 hours or preferably overnight.
- Bring to room temperature and prep
- Remove the roast from the marinade. Pat dry and let rest at room temperature for 30–60 minutes. Strain and reserve the marinade for the sauce.
Grill the sirloin
- Preheat the grill to medium-high. Sear the sirloin on all sides, then move to indirect heat and grill until the internal temperature reaches your desired doneness (130–135°F / 54–57°C for medium-rare). Rest under foil for at least 30 minutes before slicing.
Make the sauce
- Bring the reserved marinade to a boil in a saucepan. Add beef broth and simmer until slightly reduced. Strain through a sieve and adjust seasoning.
Prepare the sides
- Grill tomatoes: Drizzle with olive oil, season with salt and pepper, and grill cut-side down.
- Sauté mushrooms and onions: In a pan, cook with olive oil or butter, and chopped parsley until golden.
Serve
- Slice the grilled beef sirloin, green beans, grilled tomatoes, mushroom-onion sauté, and both sauces. Garnish with the reserved parsley and basil leaves.
Notes
Notes & Tips
- For the marinade, use only the parsley and basil stems; save the leaves to garnish when serving.
- Let the roast come to room temperature before grilling for even cooking.
- After grilling, allow the beef to rest at least 30 minutes before slicing to keep it juicy.
- Serve with boiled Finnish new potatoes as a side. See the recipe here.
- The pan sauce is made by simmering leftover marinade with beef broth and straining it for a smooth finish.
- Add a fresh and aromatic twist with homemade basil oil, a great second sauce that pairs beautifully with the beef, Check it out here.
- This dish pairs wonderfully with a good Chianti or your favorite red wine.
