This is a shortcrust tart filled with browned beef mince, slow-cooked onions, garlic, thyme, and a smear of Dijon mustard — baked until the pastry is crisp and golden. It takes about 90 minutes start to finish, but most of that is hands-off oven time, which makes it a realistic weeknight option. The filling comes together in one pan while the pastry chills, so the timing stacks up cleanly.
Why this recipe works
Two things carry this recipe. First, the onions are cooked low and slow for a full 20 minutes before the beef goes in — that patience pulls out their natural sweetness and builds a base flavor that seasoning alone can’t replicate. Second, the pastry case is chilled before filling, which keeps the fat cold and gives you a crisper bottom crust rather than a soggy one. The Dijon goes in with the garlic and thyme at the end of the stovetop stage, not on top, so it blends into the filling instead of sitting as a sharp layer.
Mistakes to avoid
- Filling the pastry while it’s still hot. Hot filling steams the raw pastry from the inside and turns the base soft before it ever hits the oven. Let the beef and onion mixture cool for at least 10 minutes off the heat first.
- Skipping the egg glaze on the edges. The beaten egg isn’t just cosmetic — it helps the pastry edges set firm and hold their shape when you slice. Brushing only the very rim is enough; skip glazing the base or you risk sealing in steam.
- Not draining excess fat from the beef. If your mince is above 15% fat, tip the pan and spoon off the rendered fat after browning. Too much fat in the filling makes the pastry greasy and the slices hard to serve cleanly.
- Undercooking the beef. Ground beef must reach 160°F (71°C) internally. Break it up thoroughly while browning — large clumps stay pink in the center even when the outside looks done.
- Overfilling the tart case. Pile the filling in level with the pastry rim, not above it. Overfilling causes spillover in the oven and uneven baking — skip the extra spoonful, it’s not worth the cleanup.
Leftovers and meal prep
Cooled tart slices keep well in the fridge for up to 3 days, wrapped or in an airtight container. Reheat individual slices in a 180°C (356°F) oven for 10–12 minutes to bring the pastry back to crisp — the microwave works in a pinch but softens the crust noticeably. The cooked beef and onion filling (without pastry) freezes well for up to 2 months; thaw overnight in the fridge and spoon into a fresh pastry case when you’re ready to bake. The assembled unbaked tart can also be frozen: freeze it solid on a tray, then wrap it tightly and bake from frozen at 180°C, adding about 15 minutes to the bake time.
French Beef Mince and Onion Tart
Ingredients
Pastry
- 1 package shortcrust pastry - pre-made or homemade
Filling
2 tablespoons olive oil - extra virgin
2 large yellow onion - sliced
500 grams ground beef (minced beef) - preferably grass-fed
1 teaspoon thyme - fresh or dried
2 cloves garlic - minced
1 tablespoon Dijon mustard
1 pinch Salt - to taste
1 pinch ground black pepper
1 medium egg - beaten, for glazing
Instructions
- Preheat your oven to 180°C (356°F).
- Roll out the shortcrust pastry on a lightly floured surface and line a 23cm (9-inch) tart tin. Trim the edges and chill in the refrigerator.
- Heat olive oil in a large skillet over medium heat. Add the sliced onions, cooking them slowly while stirring, until caramelized and golden brown, about 20 minutes.
- Increase the heat slightly and add the minced beef to the onions. Brown the beef, breaking it up with a wooden spoon until cooked through.
- Stir in the garlic, thyme, and Dijon mustard, then season with salt and pepper to taste. Cook for an additional 5 minutes.
- Remove from heat and let the mixture cool slightly. Pour the filling into the chilled pastry case.
- Lightly brush the pastry edges with the beaten egg to glaze.
- Bake in the preheated oven for 30-35 minutes until the pastry is golden and crisp.
- Let it cool for a few minutes before cutting into slices and serving.
Notes
Nutrition
Frequently asked questions
Can I use store-bought shortcrust pastry instead of making my own?
Yes, store-bought shortcrust works perfectly here and saves significant prep time. Look for a block rather than a pre-rolled sheet if you can — it’s easier to fit into the tart tin without cracking.
Do I need to blind bake the pastry before adding the filling?
No, this recipe doesn’t require blind baking — chilling the lined pastry case before filling it is enough to prevent shrinkage. The 30–35 minute bake time at 180°C is sufficient to cook the pastry through, especially if the filling has cooled before going in.
Can I make the filling ahead of time?
Yes, the beef and onion filling can be made up to 2 days ahead and stored in the fridge. Just make sure it’s fully cooled before you spoon it into the pastry case, and assemble the tart no more than an hour before baking to keep the base from going soft.
Try these next
- Savory British Beef Pies
- Savory Beef Carrot Turnovers
- Wild Venison Mushroom Pies
- Mediterranean Lamb Feta Pie
