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Uncle Bill’s French Dip and Roast Beef Sandwich: A Comfort Food Classic

My grandfather, a man of few words but discerning taste, had a very particular soft spot for roast beef sandwiches. He called them “a simple pleasure,” and I remember him carefully unwrapping a foil-covered sandwich from his lunchbox during our fishing trips. He’d always offer me a bite, the savory aroma of the beef and the hint of horseradish mixing with the fresh air by the lake. Though he is gone now, the taste of that sandwich and the warmth of those moments remain, and this French Dip recipe, inspired by his love for all things beefy, brings those memories flooding back.

Recipe Overview

Prep Time: 10 minutes
Cook Time: 7 minutes
Total Time: 17 minutes
Servings: 4
Dietary Type: Not Gluten-Free

Ingredients

4 tablespoons dry onion soup mix (Lipton’s)
3 cups water
2 teaspoons instant beef bouillon
1 lb finely sliced deli roast beef (or 1 lb of your own cooked beef)
4 large Italian buns or 4 large Portuguese buns
2 tablespoons butter
2 tablespoons horseradish, freshly processed (or more, to taste)
Salt and pepper, to taste

Equipment Needed

Coffee grinder (optional, but recommended)
One-quart microwave-safe casserole dish or glass measuring cup
Adjustable mandoline (if slicing your own roast beef)
Microwave-safe plate
Small individual bowls

Instructions

If using the dry onion soup mix as is, the end result will have tiny pieces of dried onion in the dipping broth. For a smoother broth, process the dry onion soup mix in a coffee grinder until it forms a fine powder. This step is optional but highly recommended for a more refined texture.
In a one-quart microwave-safe casserole dish or glass measuring cup, combine the water, instant beef bouillon, and the ground (or unground) dry onion soup mix.
Microwave on HIGH (full power) for 4 to 5 minutes, or until the mixture has fully dissolved. Stir the mixture at least once during microwaving to ensure complete dissolution.
Remove the casserole dish from the microwave, cover it to keep the broth hot, and set aside.
If you are using your own cooked roast beef and it hasn’t been pre-sliced, the success of this recipe hinges on thinly sliced beef. Use an adjustable mandoline set on a very thin setting to slice the roast beef to the desired thinness. Alternatively, use a very sharp knife and practice your best slicing technique.
If you desire the meat to be warm, which is highly recommended, place the thinly sliced roast beef on a microwave-safe plate, cover it with a paper towel, and microwave on MEDIUM-HIGH for 1 to 2 minutes, or until the meat is just warm. Be careful not to overcook the beef, as it can become dry.
Take your Italian or Portuguese buns and cut them partially through lengthwise, leaving a hinge so that the top and bottom of the bun remain connected.
Butter each piece of the cut bun with the softened butter.
Generously spread some horseradish over each buttered half of the bun. Feel free to adjust the amount of horseradish to your preference – some like it mild, others prefer a fiery kick!
Layer the warmed sliced roast beef into the buns, using approximately 1/4 pound of beef for each bun. Distribute the beef evenly across the bun.
Season the layered roast beef with salt and pepper to taste.
Close the sandwich bun and place it on individual plates. Cut the sandwich in half for easier dipping and eating.
Pour the hot beef broth mixture into individual small bowls. These will be your dipping bowls.
Finally, the moment you’ve been waiting for! Dip the sandwich into the beef broth mixture and enjoy this savory and satisfying classic.

Expert Tips & Tricks

Broth Boost: For an even richer broth, consider adding a splash of Worcestershire sauce or a dash of soy sauce to the broth mixture before microwaving. These additions will amplify the umami flavor of the dip.
Bread Perfection: Lightly toasting the buns before adding the butter and horseradish will give them a sturdier texture that holds up better when dipped. Keep a close eye on them to prevent burning.
Spice It Up: If you want to add a little kick to the beef itself, consider using a spicy horseradish or adding a pinch of red pepper flakes to the meat before assembling the sandwiches.
Make-Ahead Magic: The broth can be made ahead of time and stored in the refrigerator for up to 3 days. Simply reheat it in the microwave before serving. You can also slice the beef in advance, but warm it just before assembling the sandwiches to prevent it from drying out.

Serving & Storage Suggestions

Serve Uncle Bill’s French Dip immediately after assembly, accompanied by the hot beef broth for dipping. A side of coleslaw or potato salad complements the richness of the sandwich beautifully.

If you have any leftovers, store the roast beef separately from the buns and broth in airtight containers in the refrigerator. The roast beef will keep for up to 3 days, and the broth for up to 4 days. The buns are best consumed fresh but can be stored in a plastic bag at room temperature for up to 2 days. To reheat, warm the roast beef in the microwave and toast the buns lightly before reassembling the sandwich. Reheat the broth in the microwave until hot. It’s not recommended to freeze the assembled sandwich, as the bread will become soggy.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	376.3 kcal	N/A
Calories from Fat	N/A	N/A
Total Fat	12.2 g	18%
Saturated Fat	5.3 g	26%
Cholesterol	69.7 mg	23%
Sodium	2265 mg	94%
Total Carbohydrate	38.7 g	12%
Dietary Fiber	2 g	8%
Sugars	2 g	7%
Protein	26.7 g	53%

Note: Nutritional information is an estimate and can vary based on specific ingredients and portion sizes.

Variations & Substitutions

Gluten-Free Option: Use gluten-free buns instead of Italian or Portuguese buns to make this recipe gluten-free.
Spicier Dip: Infuse the broth with a pinch of cayenne pepper or a few drops of hot sauce for a spicy kick.
Cheese, Please: Add a slice of provolone or Swiss cheese to the sandwich before or after warming the beef for a cheesy variation.
Au Jus Enhancement: Instead of instant beef bouillon, use prepared au jus for an even more authentic and flavorful dipping sauce. Be sure to adjust the salt accordingly.
Vegetarian Option: While not a true French Dip, consider using marinated and grilled portobello mushrooms in place of the roast beef for a vegetarian-friendly sandwich with a similar dipping experience.

FAQs (Frequently Asked Questions)

Q: Can I use a different type of bun?
A: Absolutely! While Italian or Portuguese buns are traditional, any sturdy roll that can hold up to dipping will work well. Consider using ciabatta rolls, hoagie rolls, or even crusty sourdough.

Q: Can I make the broth ahead of time?
A: Yes, the broth can be made up to 3 days in advance and stored in the refrigerator. Simply reheat it in the microwave or on the stovetop before serving.

Q: What if I don’t have a coffee grinder for the onion soup mix?
A: No problem. While grinding the onion soup mix creates a smoother broth, it’s not essential. The sandwich will still be delicious with the slightly chunkier texture of the unground mix.

Q: Can I use a different cut of beef?
A: Yes, you can use other cuts of beef, such as sirloin or chuck roast. However, it’s important to cook the beef until tender and slice it very thinly for the best results.

Q: Can I freeze the leftover broth?
A: Yes, you can freeze the leftover broth in an airtight container for up to 2 months. Thaw it in the refrigerator overnight before reheating.

Final Thoughts

Uncle Bill’s French Dip and Roast Beef Sandwich is more than just a recipe; it’s a hug in sandwich form. The combination of tender, thinly sliced roast beef, savory broth, and a hint of horseradish is a guaranteed crowd-pleaser. Don’t hesitate to experiment with variations and make it your own. I encourage you to try this recipe, share it with loved ones, and create your own memories around this classic comfort food. And if you make it your own with a fun tweak, please share it so others can enjoy. Happy cooking, and even happier eating!

Uncle Bill’s French Dip and Roast Beef Sandwich Recipe