Sirloin Steak Crostini with Horseradish Cream & Caramelized Onions

Prep Time: 10 mins

Cook Time: 20 mins

Total Time: 30 mins

Serves: 4

Ingredients

100% Grass Fed Angus Beef Top Sirloin Steak

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8oz. 100% Grass Fed Angus Beef Top Sirloin Steak
3 Tbsp. olive oil
1 1/2 Tbsp. butter
12 Crostinis
2 Garlic cloves
1 sprig rosemary

CARAMELIZED ONIONS:

1 Yellow onion, thinly sliced
1 1/2 Tbsp. butter
1 Tbsp. olive oil
1 1/4 tsp. kosher salt

HORSERADISH CREAM:

1/2 cup sour cream
2 Tbsp. prepared horseradish
1 1/2 Tbsp. mayonnaise
1 tsp. apple cider vinegar
1 tsp. Worcestershire sauce
4 Tbsp. chives, minced
1/2 tsp. kosher salt
1 tsp. freshly cracked black pepper

INSTRUCTIONS

Melt 1 Tbsp. butter with 1 Tbsp. olive oil in a skillet over medium-low heat. Add the onion and 1 1/4 tsp. salt, and cook, stirring occasionally, until deep golden and jammy, 30–40 minutes. Set aside.
Stir together sour cream, horseradish, mayo, apple cider vinegar, Worcestershire sauce, 2 Tbsp. chives, ½ tsp. kosher salt, and ¼ tsp. black pepper in a bowl. Set aside.
Pat the sirloin dry and season it generously with salt and pepper. Heat a cast-iron skillet over high heat until smoking, about 5 minutes. Add 3 Tbsp. olive oil and lay in the steak. Flip it every 2 minutes until it’s about 120°F below your target temperature.
Add 1 1/2 Tbsp. butter, garlic cloves, and rosemary, setting the garlic and rosemary on top of the steak. Tilt the pan and spoon the melted butter over the steak for 1–2 minutes.
Let the steak rest on a wire rack for 8 minutes. Slice it thinly, about 1/4 inch thick, against the grain.
Top each crostini with a slice of steak, a small spoonful of caramelized onions, and a dollop of horseradish cream. Finish with chives and cracked pepper.

Quick Cooking Tip

For best results, always rest steaks after cooking. It keeps juices locked in, ensuring every bite is tender and flavorful.

Want to get the most out of your grass fed steak? Browse our Home Chef’s Guide to Grass Fed Angus Beef for tips, recipes, and helpful how-tos. And for safe, delicious results, always cook steak to an internal temperature of at least 145°F.