How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Roast Beef Sandwich with Watercress and Horseradish Mayonnaise?

You need 10 ingredients. The key ingredients include: 1/4 cup nonfat Greek style yogurt or 1/3 cup regular, plain nonfat yogurt, 2 tablespoons mayonnaise, 1/4 cup prepared white horseradish, squeezed of excess juice (about 3 tablespoons), 1/4 teaspoon salt, and more.

Is Roast Beef Sandwich with Watercress and Horseradish Mayonnaise suitable as meat & poultry?

Yes, Roast Beef Sandwich with Watercress and Horseradish Mayonnaise falls under the Meat & Poultry category and is a great choice for this type of meal.

How do I store leftover Roast Beef Sandwich with Watercress and Horseradish Mayonnaise?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Roast Beef Sandwich with Watercress and Horseradish

Name: Roast Beef Sandwich with Watercress and Horseradish Mayonnaise
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1/4 cup nonfat Greek style yogurt or 1/3 cup regular, plain nonfat yogurt; 2 tablespoons mayonnaise; 1/4 cup prepared white horseradish, squeezed of excess juice (about 3 tablespoons); 1/4 teaspoon salt; 1/8 teaspoon pepper; 1 bunch watercress, thick stems removed; 8 slices whole-grain pumpernickel bread; 12 ounces lean roast beef, thinly sliced; 2 medium tomatoes sliced; 1/2 small red onion, thinly sliced

Try this homemade Roast Beef Sandwich with Watercress and Horseradish Mayonnaise recipe the whole family will love. Made with yogurt, mayonnaise, white …

This Roast Beef Sandwich with Watercress and Horseradish Mayonnaise relies on simple, everyday ingredients such as mayonnaise, salt, pepper and medium tomatoes sliced. It comes together quickly and makes 4 servings, at about 283 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Meat & Poultry

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Feel free to swap in similar ingredients you already have on hand and adjust seasoning to taste.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Roast Beef Sandwich with Watercress and Horseradish Mayonnaise

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions