| 1/3 cup regular mayonnaise |
| 2 tablespoons (or more) fresh lemon juice |
| 1 tablespoon dijon mustard |
| 1/8 teaspoon cayenne pepper |
| 3/4 cup (1 1/2 sticks) unsalted butter, melted |
| 3 tablespoons boiling water |
| 1 teaspoon grated lemon peel |
| 2 tablespoons chopped fresh chives |
| 1 tablespoon chopped fresh tarragon |
| Nonstick vegetable oil spray |
| 1 tablespoon vegetable oil |
| 2 English muffins, split, toasted |