Preheat your oven to 180°C / 350°F. Line a baking sheet with parchment paper.
Toss the cauliflower florets with 1 tablespoon extra virgin olive oil and spread in a single layer on the prepared baking sheet. Season with salt and pepper.
1 medium cauliflower, salt and pepper, 1 Tablespoon extra virgin olive oil
Roast the cauliflower, stirring when halfway through, until the florets are golden brown and slightly crisp on the outside, about 30 minutes.
If you don't have pre-cooked farro (or other chewy whole grain) on hand, this is a good time to cook it. Bring a medium pot of water to the boil, salt it well, and add the uncooked farro. Reduce the heat to low, cover, and simmer for 25-30 minutes until the grains are tender but still chewy. Drain, rinse in cold water, and set aside. Cook some extra to keep in the freezer so you'll have some handy for next time!
1 cup cooked farro
While the cauliflower is roasting, toast the pine nuts in a small frying pan over medium heat, stirring frequently until nutty smelling and golden - about 5 minutes. Set aside to cool.
¼ cup pine nuts
In a large bowl combine the roasted cauliflower, farro, cannellini beans, toasted pine nuts, capers, and parsley.
14 oz can cannellini beans, ½ cup flat-leaf parsley leaves, 3 Tablespoons capers
To make the dressing, in a small bowl whisk together the tahini, lemon juice, olive oil, and lemon zest. Slowly whisk in ¼ cup water (or more if you like a looser dressing) and season with salt and freshly ground black pepper.
⅓ cup tahini paste, 3 Tablespoons freshly squeezed lemon juice, 1 Tablespoon extra virgin olive oil, 1 teaspoon grated lemon zest, ¼ cup water, salt and freshly ground black pepper
To serve, divide the salad into bowls and drizzle with tahini dressing. Sprinkle with extra capers and parsley.