1. Roast chickpeas
Preheat oven to 425ºF with a rack in the lower third. Rinse and drain chickpeas; wrap in a clean kitchen towel to remove excess water. On a rimmed baking sheet, toss chickpeas with 1 tablespoon oil, 2 teaspoons cumin, and season with salt and pepper. Roast on lower oven rack, shaking baking sheet a few times, until chickpeas are golden and crisp, 20–25 minutes (watch closely).
2. Cook grains
Finely chop 1 teaspoon garlic. Heat 2 teaspoons oil in a small saucepan over medium-high. Add grains and ½ teaspoon of the chopped garlic. Cook until fragrant and grains are lightly toasted, 1–2 minutes. Add 1¼ cups water and ¼ teaspoon salt; bring to a boil. Reduce heat to low, cover, and cook until grains are tender and water is absorbed, 10–12 minutes.
3. Pickle radishes
Meanwhile, trim ends from radishes, then thinly slice. In a large bowl, combine 1 tablespoon vinegar and a pinch each of sugar and salt. Add radishes and toss to combine. Let pickle until step 6. Once grains are cooked, fluff with a fork and spread out on a second rimmed baking sheet to cool until step 6.
4. Make dressing
Finely chop dill fronds and stems. Into a medium bowl, finely grate 1 teaspoon lime zest and squeeze 1½ teaspoons juice. Whisk in remaining garlic, ⅓ cup Greek yogurt, 1 tablespoon each of oil and water, 2 teaspoons of the chopped dill, and a pinch of sugar. Season to taste with salt and pepper.
5. Finish salad
To the large bowl with radishes, add spinach and 1 tablespoon oil, and toss to combine.
6. Assemble & serve
Spoon grains, roasted chickpeas, and spinach salad into bowls. Drizzle dressing and sprinkle remaining dill on top. Enjoy!