½ cup pecans or walnuts
1 medium shallot, halved lengthwise, divided
2 tablespoons whole grain mustard
1 teaspoon sugar
½ cup red wine vinegar, divided
⅓ cup olive oil
sea salt and freshly ground pepper
6 dried figs, very coarsely chopped
1 fennel bulb, core removed, very thinly sliced
8 celery stalks, very thinly sliced
4 ounces gorgonzola cheese, crumbled