Step 1: Preheat the oven to 375 degrees.
Step 2: Cook the pasta in water (it should still have a firm center when you drain it, al dente).
Step 3: Mix together, the butter and the egg yolks, then add the sour cream.
Step 4: Clean the spring onions and chop them very thoroughly (this is best to be done in a food processor, fast and very finely chopped).
Step 5: Chop the ham.
Step 6: Add the spring onions, ham, 3/4 of the grated cheese, the crushed garlic, salt, pepper and marjoram to the butter mixture and combine well.
Step 7: Add the drained pasta and combine well again.
Step 8: Whisk the egg whites until stiff and fold them into the pasta mixture.
Step 9: Transfer everything into a buttered ovenproof dish and sprinkle the remaining cheese on top.
Step 10: Bake in the oven for about 40 minutes
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