Chris Fischer uses Romanesco cauliflower, which has green florets, for this recipe. If you can't find it at your farmers' market, substitute regular cauliflower.
Heat oil in a large saute pan over medium-high heat. Place cauliflower, flat side down, in pan, and cook until golden on underside, about 8 minutes.
Flip cauliflower, and season with salt and pepper. Cook until tender and golden brown, about 3 minutes. Add lemon juice and peas, and cook until peas are tender. Serve immediately.