To start, bring your oil to medium-high heat in a large pot.
Add in your vegetables and sauté until they begin to brown. You want them to have a bit of char, but still maintain their firmness.
When they're just browned, add in the vegetable broth, water, salt, and spices. Stir for a minute, then carefully taste and adjust seasoning if desired (i.e. add more salt).
Simmer the soup for 10 minutes on low heat. When done, remove from heat.
Add in the lemon juice, spinach, and cucumbers. Do NOT add in the greens earlier than this, they will wilt.
Garnish with celery greens or hemp seeds, if you'd like.