How to Make It
In a small skillet, toast the fennel seeds over moderately high heat until fragrant. Transfer the seeds to a spice grinder and let cool completely; grind to a powder.
In a large bowl, whisk the ground fennel with the vinegar, lemon juice, mustard and garlic. Whisk in the oil; season with salt and pepper. Add the mâche and toss gently. Scatter the goat cheese on top and serve.