Oven-Roasted Beef Sirloin with Horseradish Cream

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

Juicy beef sirloin roasted to medium-rare and paired with a sharp horseradish cream sauce, a classic British accompaniment. This british-inspired beef ready in about 70 minutes pairs beef sirloin roast, olive oil, salt for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart.

Prep: 25 min Cook: 45 min Serves 6 British cuisine 350 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 400°F. Rub 2 lbs beef sirloin roast all over with 2 tbsp olive oil, 1.5 tsp salt, 1 tsp black pepper, 3 minced garlic cloves, and 1 tbsp chopped fresh thyme. Let sit at room temperature for 20 minutes.
  2. Step 2: Place beef on a roasting rack in a shallow pan and roast in the center of the oven for 20 minutes. Reduce heat to 350°F and continue roasting for 20-25 minutes more for medium-rare (internal temp 130°F).
  3. Step 3: Remove roast from oven, tent loosely with foil, and rest for 15 minutes before slicing.
  4. Step 4: Meanwhile, mix 1/2 cup sour cream with 2 tbsp prepared horseradish and 1 tsp fresh lemon juice in a small bowl. Adjust horseradish to taste.
  5. Step 5: Slice beef thinly and serve with a dollop of horseradish cream on the side.

Frequently asked questions

How long does Oven-Roasted Beef Sirloin with Horseradish Cream take to make?

Total time is about 70 minutes (25 min prep + 45 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Oven-Roasted Beef Sirloin with Horseradish Cream?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep beef sirloin roast from drying out.

Can I substitute ingredients in Oven-Roasted Beef Sirloin with Horseradish Cream?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Oven-Roasted Beef Sirloin with Horseradish Cream for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Oven-Roasted Beef Sirloin with Horseradish Cream?

British beef like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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