Does anyone know why my mayonnaise keeps coming out bitter? I've made it four times. This last time was with a no vinegar recipe, just lemon juice. One egg, salt, lemon juice, olive oil, bit of hot water for emulsion. I followed the instructions exactly, amounts and slow pouring of the oil, interspersed with teaspoons of hot water. The only thing I left out was a 1/2 teaspoon of dry mustard. But that doesn't explain why it's bitter. Not as bitter as the other recipe I tried, but too bitter to use. Any thoughts? I'm trying to avoid vinegar and I adore mayonnaise, so I'd really like to be able to make it myself.