1- Put a little olive oil in a sauté pan and add the meat.
2- When the meat is cooked, add the peeled and blended tomatoes (personally I pass them through a food mill to get some flesh and all the juice) and the sliced onion. Salt, pepper and add 4-spice blend and/or Herbes de Provence and basil.
3- Taste to check the seasoning and let simmer with a partial cover until the tomato sauce has evaporated well (approximately 1 hour 30 minutes).
4- Preheat the oven to thermostat 7 (210°C).
5- Prepare the béchamel
6- Boil water and put 3 lasagna sheets in to soften them (approximately 1 minute). (you can choose lasagna sheets that do not need to be softened).
7- In a gratin dish, put the 3 lasagna sheets at the bottom, Bolognese sauce on top, béchamel, Parmesan and repeat, taking care to put 3 lasagna sheets in the boiling water to soften each row.
8- Finish the last row of 3 sheets by putting béchamel on top and grated Gruyère.
9- Put in the oven for 25-30 minutes.
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