Hand Salad With Buttermilk, Grapefruit, and Mixed Seeds

Toast coriander seeds and fennel seeds in a dry small skillet over medium heat, shaking often, until fragrant, about 2 minutes. Let cool. Using the side of a chef’s knife, lightly crush spices on a cutting board. Transfer to a small bowl and mix in garlic, lemon zest, and cream. Cover and chill 1 hour. Strain infused cream through a fine-mesh sieve into a medium bowl; add buttermilk and whisk until soft peaks form. Season with salt, then mix in grated chile. Whisk grapefruit juice, lemon juice, vinegar, and ginger in a large bowl and season with salt. Add lettuce wedges to bowl, season with salt, and toss to coat. Arrange lettuce wedges on a platter. Using a small spoon, swipe some infused cream over lettuce wedges. Sprinkle with half of assorted seeds, then drizzle with oil and top with Aleppo-style pepper and grapefruit zest. Sprinkle remaining assorted seeds over remaining infused cream and serve alongside lettuce wedges for dipping.