Directions

1. Prepare pickled vegetables: Using a vegetable peeler, peel off several long ribbons of carrot, zucchini, and yellow squash, about 20 ribbons total. In a small saucepan, combine the vegetable ribbons with the vinegar, sugar, salt, mustard seeds, peppercorns, and red pepper flakes. Bring the mixture to a boil, then remove from the heat and let sit for 2 minutes. Add ice to stop the cooking. Set aside.
2. Put the room-temperature mascarpone cheese in a small metal bowl and whisk until light and fluffy.
3. Toast the bread using your preferred method, then spread equal amounts of the whipped cheese on each piece.
4. Use a fork to remove the vegetable ribbons from the pickling brine, and arrange in piles on top of each toast. Finish each tartine with a sprinkling of pepitas and a few sprigs of fresh dill.