(as seen on allrecipes.com)
2 cloves garlic, sliced or 1 tbsp chopped garlic scape
1 pinch kosher salt
1 tablespoon chopped fresh tarragon
1/2 cup mayonnaise
2 teaspoons fresh lemon juice
1 pinch cayenne pepper, or to taste
1) Crush garlic and salt together in a mortar with a pestle; add tarragon and continue crushing with the pestle until tarragon is pulverized.
2) Stir mayonnaise and lemon juice into garlic-tarragon mixture until aioli is smooth; season with cayenne pepper.