Homemade Green Curry Paste

1 stalk lemongrass, tough outer layers removed and discarded, roughly chopped

3 green Thai chilis, roughly chopped (adjust with different chilis or the amount to achieve desired heat/spice preference)

6 scallions, root ends and tough green tips trimmed, roughly chopped

3 tablespoons garlic, roughly chopped, about 6 cloves

1 thumb-size piece of peeled ginger or galangal, roughly chopped (about 1 tablespoon)

½ cup Thai or other basil

½ cup fresh cilantro leaves and stems

2 teaspoons ground cumin

2 teaspoons ground coriander

2 tablespoons fish sauce

2 teaspoons light brown sugar