In a large skillet over medium-high heat, add 1 Tbsp olive oil and tempeh pieces; brown, stirring occasionally. Remove from pan, set aside in a small bowl, and add dash of black pepper.
In a medium-size paella pan or large skillet over medium heat, heat remaining oil. Add onion, garlic, carrot, saffron, paprika and farro. Sauté 7 minutes, stirring occasionally. Add bell peppers, mushrooms, salt, ground pepper, tomatoes and tempeh. Sauté another 5 minutes, stirring occasionally. Mix in peas.
Pour in stock, and increase heat to high. Bring to a boil; then reduce heat to low, while stirring. Cover pan with foil, and allow to cook 30–35 minutes; then turn off heat. Leaving foil on pan, allow to steam with no heat for an additional 15 minutes.
Remove cover from paella. Garnish with parsley and lemon wedges.