Heat a large Dutch oven over medium-high heat and add a tablespoon of olive oil. Working in batches to avoid overcrowding, brown the beef on all sides, seasoning with salt and pepper. Remove and set aside.
In the same Dutch oven, add the chopped onion, carrots, and celery. Sauté until the vegetables are softened, about 5-7 minutes. Add the diced speck or bacon and the minced garlic and cook for another 1-2 minutes.
Stir in the tomato paste and cook for 1-2 minutes to caramelise slightly. Pour in the red wine to deglaze the pot, scraping up any browned bits from the bottom. Let the wine simmer for a few minutes until it has reduced slightly and darkened in colour.
Add the canned diced tomatoes and beef stock and return the browned beef chunks to the pot. Add the fresh thyme sprigs (or dried thyme) and stir to combine.
Bring the mixture to a gentle simmer. Reduce the heat to low, place on the lid and let it simmer for 2-3 hours, or until the beef is tender and the sauce has thickened, stirring occasionally. If there is still a lot of liquid, you can remove the lid for the final 30 minutes to 1 hour to ensure the sauce thickens.
During the last 15-20 minutes of cooking, bring a large pot of salted water to a boil. Cook the fresh lasagna noodle strips until al dente, about 3 minutes. Drain and set aside.
Once the beef is tender, remove the thyme sprigs. Add the cooked lasagna noodle strips to the ragu, gently tossing to combine. Season with salt and pepper to taste, and serve immediately, garnished with freshly chopped parsley.