Preparing fresh ones from scratch is a bit laborious, I suppose.
You need to trim the stalk , which is edible, then snap off al the leaves until you reach the choke, or heart. With a teaspoon, you can scrape out the hairy bit and then you've got the heart all by itself. It needs to go into acidulated water immediately, because it begins to oxidise once exposed to the air. The leaves can be boiled for 10-15 minutes and served with butter, lemon juice, olive oil, etc. as a snack. Alternately, you can take each cooked leaf and scrape off the "meat"from the bottom, which can be used accordingly.
The heart can be diced or sliced or left whole.There's a Tapas bar in Barcelona that slices them thick and then fries them in olive oil. You can also slice them thick, wrap them in bacon and bake until cooked through, as an amuse bouche. Dice the hearts (cooked), mix with garlic, sundried tomatoes, anchovies, olives ( black and white), capers, basil and come chayote squash (adds a bit of volume!) and you've got a lovely antipasto or a topping for bruschetta or montadito. Mix with bacon or pancetta, a little fried onion, garlic, sage and a bit of cream, or cream cheese, and you can make quiche, or fill tartlets, or make pasties (empanadas).