How to Make It
In a medium skillet, combine the fingerling potatoes with 2 tablespoons of the olive oil, the garlic, saffron and a pinch each of salt and pepper. Add 2 cups of water to cover and simmer over moderately low heat until the potatoes are tender, about 12 minutes. Drain and let cool slightly. Discard the garlic.
In a large bowl, whisk the mayonnaise with the lemon juice and the remaining 2 tablespoons of olive oil; season with salt and pepper. Add the potatoes, tomatoes and diced fennel and toss. Add the mixed baby greens, season with salt and pepper and toss again. Serve right away.