1. Prepare 800 g of Brussels sprouts.
2. Cook them in boiling salted water until tender, not overcooked. Drain them.
3. Prepare and finely chop 1 shallot.
4. In a pan over medium heat, pour 3 tablespoons of olive oil and when it is hot, add the shallot, thyme, salt, and pepper. Cook for 1 minute while stirring.
5. Add the drained Brussels sprouts and mix well.
6. Pour in 250 ml of liquid heavy cream, season with salt and pepper, mix well.
7. Let it thicken to your liking, then remove and discard the thyme, check the seasoning, and just before serving, add 1 tablespoon of lemon juice.
8. Serve hot.