Make the salsa verde by combining all ingredients plus a generous pinch of salt in a food processor or blender. Work until smooth. Taste and add more salt if necessary.
Spread crème fraîche evenly over the 4 slices of toast. Top with the salmon and radish slices. Drizzle with salsa verde and serve.
Notes
If you are yeast intolerant, like myself, use a tortilla that you've crisped up on the stove top.If you are gluten or wheat intolerant, try a rice cake or a gluten free bread.And if you are in a hurry, try a crisp bread cracker like Wasa in lieu of the toast.