This is a quick, smoky aioli made by charring scallions until blistered, then blending them with mayonnaise, lime, garlic, and a touch of honey. The whole thing comes together in about 15 minutes. It’s worth making because it tastes genuinely different from anything you can buy — the charred scallions give it a depth that plain garlic aioli just doesn’t have.
Shopping notes
- Scallions: You need a bunch with firm, bright green tops — avoid any that are slimy or yellowing. The char only works well when the scallions are dry and fresh.
- Lime: Fresh only. Bottled lime juice is flat and won’t give you the zest the recipe calls for.
- Mayonnaise: Full-fat works best here. Light mayo has added water and starch that can make the aioli thin and slightly gummy.
- Honey: Any mild honey works. Skip anything strongly flavored like buckwheat — it’ll fight the lime.
Before you start
The one thing that actually matters is getting the scallions properly dry before they hit the pan or grill. Pat them with a paper towel after rinsing. Wet scallions steam instead of char, and you’ll end up with soft, pale green onions instead of the blistered, slightly sweet ones the recipe depends on. Also, let the charred scallions cool completely before you chop and mix them in — adding them warm will loosen the mayo and give you a greasy, separated aioli instead of a thick, creamy one.
What can go wrong
- Aioli turns out watery: The scallions were still warm when mixed in, or the lime juice was added all at once. Stir the juice in gradually and always use cooled scallions.
- Bitter, acrid flavor: The scallions went past charred into burnt. You want dark blistered spots, not fully blackened stalks. Pull them off the heat as soon as they blister and soften.
- Garlic taste is too sharp: Raw garlic straight from the knife can be harsh. Mince it as finely as possible — or mash it to a paste with a pinch of salt using the flat of your knife — so it disperses evenly rather than hitting in chunks.
- Aioli is too loose to spread: This usually means too much lime juice. Add the juice a little at a time and taste as you go. If it’s already too thin, a spoonful more mayo will bring it back.
- Flavor tastes flat after refrigerating: Cold mutes everything. Pull the aioli out 10 minutes before serving and give it a quick stir — that’s usually enough to wake it up.
Make-ahead notes
This aioli keeps well in the fridge for up to 4 days in a sealed container. The flavor actually improves after a few hours as everything settles together, so making it the night before a cookout is a smart move. Do not freeze it — mayo-based sauces break when frozen and thawed, leaving you with a greasy, curdled mess. There’s no reheating needed; just serve it cold or at room temperature.
Charred Scallion and Lime Aioli
Ingredients
- 6 stalks scallions Trimmed, with whites and greens intact
- 1 cup mayonnaise Preferably homemade or high-quality store-bought
- 1 clove garlic Finely minced or grated
- 1 tablespoon lime zest Freshly grated
- 2 tablespoons fresh lime juice About 1 whole lime
- ½ teaspoon kosher salt Adjust to taste
- ¼ teaspoon black pepper Freshly ground
- ½ teaspoon honey To balance flavors
- 2 tablespoons olive oil For grilling the scallions
Instructions
- Heat a grill or cast-iron pan over medium-high heat. Lightly brush the scallions with olive oil.
- Grill the scallions for 2-3 minutes, turning occasionally, until charred and softened. Let them cool slightly.
- Finely chop the charred scallions and add them to a bowl with mayonnaise, garlic, lime zest, lime juice, salt, black pepper, and honey.
- Whisk or blend until smooth and well combined. Taste and adjust seasoning if necessary.
- Cover and refrigerate for at least 30 minutes to allow flavors to meld before serving.
Notes
- For a smokier depth, consider grilling the scallions over an open flame.
- You can substitute Greek yogurt for mayonnaise for a lighter version.
- For extra complexity, add a dash of smoked paprika or finely chopped cilantro.
Nutrition
FAQ
Can I use a cast-iron skillet instead of a grill?
Yes, a dry cast-iron skillet over high heat works just as well as a grill for charring scallions. Get the pan fully hot before you add them, and don’t move them around — let them sit undisturbed for a minute or two per side so they actually blister rather than just soften.
Can I substitute Greek yogurt for the mayonnaise?
You can, and it gives you a tangier, lighter result. Use full-fat Greek yogurt and expect a slightly thinner consistency — the aioli won’t hold its shape on a bun quite as well, but it works fine as a dip or drizzle.
How much lime juice is the right amount?
Start with the juice of half a lime, taste, and add more from there. Skip the egg in the mix — it makes the patty mushy applies here too in spirit: more liquid than the mayo can absorb will break the texture, so go slowly and stop when it tastes bright but still creamy.
Try these next
- Hawaiian Teriyaki Burger — another great use for a citrus-forward sauce
- Ultimate Avocado Bacon Smash Burger — pairs well with a smoky aioli spread
- Korean Fried Chicken Burger — bold flavors that work with a charred scallion sauce
- Angus Bacon Guacamole Burger — a gourmet build that benefits from a punchy condiment