---
title: Pan-Seared Sirloin and Savory Demi-Glace Sauce
source:
  name: HelloFresh
  url: https://www.hellofresh.com/recipes/2019-w10-r16-5c47886fc445fa66c31b7ac2
servings: 2
prep time: 10 minutes
cook time: 30 minutes
time required: 40 minutes
difficulty: Easy
allergens:
  - Milk
  - Tree Nuts
tags:
  - Steakhouse
  - High Protein
  - Dinner
  - Meat
  - Comfort Food
rating: 4.0
rating_count: 774
source_chef: Recipe Development Team
image: "https://images.recipes.furrysalamander.com/pan-seared-sirloin-and-savory-demi-glace-sauce.avif"
---
Preheat oven to 425°F.

Wash and dry all produce.

Dice @sweet potatoes{2%lbs} into ½-inch cubes.

Zest @lemon{1%unit} until you have 2 tsp; quarter lemon.

Thinly slice @chives{1%unit}.

Trim and halve @brussels sprouts{1%lb}.

Place sweet potatoes in a #medium pot{} with enough salted water to cover by 2 inches.

Boil until tender ~{15%minutes}. Drain.

Melt 2 tbsp @butter{4%tbsp} in same pot over low heat.

Add sweet potatoes and mash until smooth.

Stir in @sour cream{2%tbsp} and half the chives; season with salt and pepper.

While sweet potatoes cook, toss brussels sprouts on a #baking sheet{} with 1 tbsp @olive oil{1%tbsp}, salt, and pepper.

Roast until browned and slightly crispy ~{20%minutes}.

While brussels sprouts roast, place @almonds{¼%cup} in a #medium pan{} over medium-high heat.

Cook, stirring often, until lightly browned and fragrant ~{4%minutes}.

Turn off heat; transfer to a #small bowl{}.

Toss with lemon zest, salt, and pepper. Wipe out pan.

Pat @sirloin steak{1%unit} dry with paper towels; season all over with salt and pepper.

Heat 1 tbsp @vegetable oil{1%tbsp} in same pan over medium-high heat.

Add steak and cook to desired doneness ~{4%minutes} per side.

Turn off heat; remove steak from pan and let rest ~{3%minutes}. Wipe out pan.

Add @beef demi-glace{1%unit} and ½ cup water to same pan.

Bring to a boil over medium-high heat, then reduce heat to low.

Whisk in remaining 2 tbsp butter and any resting juices from steak.

Season with salt and pepper.

Toss brussels sprouts with almonds and juice from 2 lemon wedges.

Thinly slice steak.

Divide sweet potatoes, brussels sprouts, and steak between plates.

Top steak with sauce.

Sprinkle with remaining chives.