Dice the onions, carrots, sweet potatoes, and garlic and set aside.
In a large pot with a lid, drizzle about 1 tablespoon of olive oil and add the onions and a sprinkle of salt. Sautee over medium heat for about 5 minutes or until they become translucent.
Add the minced garlic and let sizzle until fragrant, about 30 seconds.
Pour in the wine or 1/4 cup of vegetable broth to deglaze the pan.
Add the lentils, Herbs de Provence, lavender, sweet potatoes, carrots, broth, and water to the pot. Raise the heat to medium-high and bring to a slow boil. Reduce heat to medium and cover.
Cook covered for about 30 minutes, stirring occasionally.
Once the lentils are done, you can serve it as is, or if you like it a bit thicker, I like to blend up about half of the soup and return it to the pot. Finish with a bit of salt if needed, fresh cracked pepper, and 1 teaspoon of lemon juice.