Rinse and drain quinoa, in auspice pan high heat cook quinoa and garlic 1 minute stir constantly. Add water salt saffron bring to boil, cover simmer till water absorbed. Stir to fluff.
Cut peppers in half lengthwise leave stems on to stabilize. Remove seeds brush inside and out with oil place cut side down on baking sheet. Roast about 15, softened but still firm, set aside to cool and reduce oven to 350.
Warm oil on med heat add onion cook till soft, add salt and carrots, cover and cook 3-4 min, add mushroom cover cook till all tender about 5 min
Combine cooked quinoa, veggies, currants, and tarragon, season salt and pepper. Stir in lemon juice. Fill peppers and top with cheese, loosely cover with foil and bake till hot through, 10-15 min
Can stuff the peppers ahead of time then heat when ready to serve.