Blend: In a food processor, add the kale (leaves only, no stems), walnuts, parmesan, garlic, lemon zest, lemon juice, salt and pepper (everything except the olive oil). Blend into a paste.
Add the oil: With the processor still running, gradually drizzle in the olive oil until you reach your preferred consistency, more for a thinner pesto. Taste and adjust seasoning.
Store: Transfer to a jar and refrigerate for up to 10 days. After each time you use some, top the jar with a thin layer of fresh olive oil, this seals it from air and helps keep its bright green color.
Notes:
For a vegan version, leave out the parmesan, and mix the walnuts with cashews or another nut for more depth of flavor.
Swap half the kale for basil if you want a milder flavor or just a change of pace.
For pasta: warm the pesto in a pan with about ½ cup of pasta cooking water for 2 minutes, then toss in the cooked pasta.
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