In a 2-cup jar, combine the olive oil, vinegar, Dijon mustard, and blood orange juice.
Seal the lid tightly and shake vigorously until fully emulsified.
Taste and adjust with salt and black pepper as needed.
Store in the refrigerator for up to 2 weeks.
Notes
Storage: Keep this in a sealed jar in the fridge for up to 2 weeks. The oil will solidify when cold, so let it sit at room temperature for 10-15 minutes and shake well before using.