Spinach Pesto Quinoa Salad

uncooked quinoa

chicken or vegetable broth

package frozen peas OR 1/4 lb. fresh snow peas, ends trimmed and sliced into 1/2-inch pieces

bunch radishes, thinly sliced

baby spinach packed, divided

raw or lightly toasted walnuts

garlic

juice and zest of one small lemon

sea salt

olive oil