Wash and slice shallot, leek (just the white part, discarding the green leaves) and shiitake mushrooms. Wash and chop green beans into about 1-inch pieces.
Wash and dice yellow squash.
Saute shallots and leek until flagrant. Add mushrooms and saute until softened. Add green beans and squash. Cook, stirring often, for 5-7 minutes.
Smash garlic cloves and dice them. Add garlic to the pot. Saute until fragrant.
Add vegetable broth and bring to boil.
Add tortellini, thyme, salt and a good amount of fresh cracked black peppercorns (to taste). Cook until tortellini is done.