Vegan Pesto Stuffed Shells (with Split Peas!)

Ingredients (for 2 servings)

• 1 cup — dry green split peas
• 2.25 cup — water
• 1 cup — tightly packed fresh basil leaves
• 1 tbsp — lemon juice
• 1 clove — garlic
• 1 tsp — fine sea salt
• 12 oz — pasta shells