Curried Egg Tartines

Name: Curried Egg Tartines
Ingredients: 8 large eggs; 3 radishes, trimmed, thinly sliced (optional); 1 cup coarsely chopped tender herbs (such as parsley, chives, and/or dill); 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, divided; Juice of 1 lemon; 3 scallions; 3 Tbsp. extra-virgin olive oil, divided; 4 thick slices country-style bread (such as ciabatta or sourdough); 1½ tsp. curry powder (preferably Madras); ½ cup Kewpie mayonnaise; 1 Tbsp. Dijon mustard; Flaky sea salt; Aleppo-style pepper (for serving)