Peel and finely chop the onion. Heat 1 tbsp. butter, fry the onion until transparent. Grate beetroot finely on a kitchen grater. (Attention! They stain strongly, best to wear disposable gloves.) Separate the eggs.
Mix onion, beetroot, egg yolk and cream cheese. Season with salt and pepper.
Roll out the pasta dough and cut out dough circles with a round cookie cutter or glass (approx. 6 cm Ø). Whisk the egg white and brush the edges of the dough with it. Fill dough circles and form into ravioli.
Form short pasta (e.g. strozzapreti) from the leftover dough and cover and chill for the next day.
Bring 3-4 l salted water (approx. 1 teaspoon salt per litre) to the boil in a wide saucepan. Cook half of the ravioli in it for about 5 minutes in slightly simmering water. Remove the finished ravioli with a skimmer and drain well.
Cook the remaining ravioli in the same way and drain.
In the meantime, wash the thyme for the nut butter, shake dry and pluck the leaves. Roughly chop the walnuts. Heat 4 tablespoons of butter in a large pan. Roast the nuts in it while turning. Stir in thyme, season butter with salt.
Toss the ravioli in portions in the walnut butter. Serve.