@snarkysteff ducks eggs are great for carbonara too,
I'm not sure why you say mayo will spoil in 5 days unless fermented. I've made some (chicken yolks) and sardine can olive oil that has lasted a month. There's enough acid in the mayo that it should be ok.
Regular (commercial) mayo (edited out: i̶n̶ ̶j̶a̶r̶s̶) doen't need to be refrigerated really if contamination is kept out
snarkysteff