Lemony Whipped Feta With Charred Scallions

INGREDIENTS

1 1/2

lemons, plus more to taste

bunch scallions, trimmed and halved crosswise

1/3 cup

plus 3 tablespoons olive oil

10 oz

feta cheese, broken into large pieces (about 2 1/2 to 3 cups)

4 oz

cream cheese, at room temperature

1/4 tsp

black pepper, plus more for garnish

1/4 tsp

cayenne, plus more for garnish

1 tbsp

hot water