In a dry skillet over medium heat, toast the cumin seeds for about 2 minutes, stirring frequently until fragrant and slightly darker. Transfer to a cutting board and lightly crush them with the back of a spoon—this releases their essential oils for a deeper flavor. In the same skillet, toast the slivered almonds for 3-4 minutes, stirring constantly until golden and fragrant. Watch carefully as nuts burn easily. Set both aside to cool slightly. I find toasting these components separately prevents the delicate almonds from over-browning while the cumin fully develops its aroma.
In a small bowl, whisk together the olive oil, lemon juice, honey, and the toasted crushed cumin seeds. Season with a pinch of salt and black pepper, then taste and adjust the balance—you want the brightness of lemon to shine with the honey providing subtle sweetness and the cumin adding warmth. Set the dressing aside at room temperature.
Slice the celery thinly on a bias—this creates attractive pieces and exposes more surface area for the dressing to coat. Pit and slice the medjool dates into 1/4-inch strips, then slice the green onions (white and light green parts) into thin rings. Shave the pecorino cheese using a vegetable peeler or box grater to get thin, curly pieces. I prefer shaved pecorino over grated because it provides nice pockets of flavor rather than being evenly distributed throughout.
In a large bowl, combine the cooked lentils with the sliced celery, dates, green onions, toasted almonds from Step 1, and shaved pecorino. Pour the dressing from Step 2 over everything and toss gently but thoroughly, making sure the dressing coats all the components evenly. Let the salad sit at room temperature for 10-15 minutes—this resting time allows the flavors to meld and the celery to absorb some of the dressing while staying pleasantly crisp.
Taste the salad and adjust seasonings as needed—add more salt, lemon juice, or honey depending on your preference. Finish with a small pinch of Aleppo chili flakes for a subtle heat and fruity undertone that complements the earthiness of the lentils. Toss gently once more and serve at room temperature or chilled.