Avocado Mayonnaise

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1 large egg yolk

1/2 teaspoon salt

1/4 teaspoon freshly ground black pepper

2 teaspoons Dijon mustard

2 tablespoons lemon juice

3/4 cup olive oil

1 tablespoon boiling water

1 avocado, peeled and pitted

2 tablespoons fresh lime juice

1/2 small red onion, minced

1/2 bunch flatleaf parsley, leaves only coarsely chopped