Juice half a lime. Add the mayonnaise, lime juice, chili paste, miso paste, and sesame oil to a bowl.
Stir to combine. Do a taste test and add more lime juice or chili paste if needed. Add a splash of water to thin out the sauce if needed.
Notes
Chili paste: Truly any chili paste will do for this recipe. Use the one you can find at your regular grocery store or Asian market. I recommend finding one with simple ingredients, such as red chili pepper, (rice) vinegar, garlic, and eventually alcohol, and making sure chili is one of the main ingredients. Don't use chili oil. You can read more different types of chili pastes in the post above.
Storage tips: You can store the poke bowl sauce for up to 3 days in an airtight container in the refrigerator.