To make the dressing, place all ingredients except the oil in a blender or food processor and process until smooth. Slowly stream in oil and let mix until smooth, creamy and emulsified. To make by hand, whisk together shallot, lemon juice, vinegar, honey, mustard and salt until smooth, then stir in poppy seeds. Whisking continuously, slowly add oil in small additions until smooth, creamy and emulsified. Store chilled until ready to use.