Vegan Thai Lettuce Cups with Green Split Peas

olive oil

red onion (, chopped)

carrots (, chopped (about 3/4 cup))

celery stalks (, chopped (about 3/4 cup))

fresh ginger (, minced)

garlic clove (, minced)

tamari ((gluten-free soy sauce))

maple syrup

green split peas

water

head butter lettuce

shredded carrots (, for garnish (optional))

chopped fresh cilantro (, for garnish (optional))

fresh lime slices (, for garnish (optional))