Grilled Flat Iron Steak with Pistachio Pesto Butter

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Pesto Butter:

2 sticks butter, room temperature

1 cup packed basil leaves

4 to 5 cloves garlic

1 teaspoon kosher salt

Pinch coarse ground black pepper

Dash fresh lemon juice

3 tablespoons extra-virgin olive oil

1/4 cup Asiago cheese

2 tablespoons pistachios

Pinch red pepper flakes

Steak:

Olive oil

4 (8-ounce) flat iron steaks

Salt and freshly ground black pepper