Slow-Roasted Beef Brisket with Root Vegetable Mash

By AislePrompt Editorial · Published 2026-05-08 · Updated 2026-05-08

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are drafted and published.

Tender slow-roasted beef brisket accompanied by a creamy mash of traditional British root vegetables, offering rich, comforting flavors. This British-inspired beef recipe, ready in about 315 minutes, pairs beef brisket, olive oil, salt for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 580 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. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 300 min Serves 6 British cuisine 580 cal/serving

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Ingredients

3 lbs beef brisket
2 tbsp olive oil
1 1/2 tsp salt
1 tsp black pepper
3 medium, peeled and chopped carrots
2 medium, peeled and chopped parsnips
2 large, peeled and chopped potatoes
3 tbsp unsalted butter
1/2 cup whole milk
1 tbsp chopped fresh thyme
3, smashed garlic cloves

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Instructions

Step 1: Preheat oven to 275°F. Rub 3 lbs beef brisket with 2 tbsp olive oil, 1 1/2 tsp salt, and 1 tsp black pepper. Place in roasting pan with 3 smashed garlic cloves and 1 tbsp chopped fresh thyme.
Step 2: Cover brisket tightly with foil and roast for 4-5 hours until fork-tender and internal temperature reaches 195°F.
Step 3: Meanwhile, place 3 chopped carrots, 2 chopped parsnips, and 2 chopped potatoes in a large pot of salted water. Boil for 20 minutes until vegetables are soft.
Step 4: Drain vegetables and mash with 3 tbsp unsalted butter and 1/2 cup whole milk until smooth and creamy. Season with salt and pepper to taste.
Step 5: Slice the rested brisket against the grain and serve atop the root vegetable mash for a hearty, traditional British meal.