Preparation Toast flaxseeds in a large dry skillet over medium heat, tossing often, until fragrant, about 2 minutes; transfer to a small bowl. Toast amaranth in same skillet until fragrant, about 2 minutes; add to flaxseeds and let cool. Whisk crème fraîche, horseradish, and vinegar in a large bowl. Thin with water, if needed; season with salt and pepper. Add greens and flowers, if using, and toss to coat. Serve topped with flaxseeds and amaranth. DO AHEAD: Flaxseeds and amaranth can be toasted 5 days ahead. Store airtight at room temperature.
Preparation Toast flaxseeds in a large dry skillet over medium heat, tossing often, until fragrant, about 2 minutes; transfer to a small bowl. Toast amaranth in same skillet until fragrant, about 2 minutes; add to flaxseeds and let cool. Whisk crème fraîche, horseradish, and vinegar in a large bowl. Thin with water, if needed; season with salt and pepper. Add greens and flowers, if using, and toss to coat. Serve topped with flaxseeds and amaranth. DO AHEAD: Flaxseeds and amaranth can be toasted 5 days ahead. Store airtight at room temperature.